Network Working Group L. Wang Internet-Draft Individual Intended status: Standards Track H. Ananthakrishnan Expires:April 20,May 4, 2016 Packet Design M. Chen Huawei A. Dass S. Kini Ericsson N. Bahadur Bracket ComputingOctober 18,November 1, 2015 A YANG Data Model for Routing Information Base (RIB)draft-ietf-i2rs-rib-data-model-02draft-ietf-i2rs-rib-data-model-03 Abstract This document defines a YANG data model for Routing Information Base (RIB) that aligns with the I2RS RIB information model. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire onApril 20,May 4, 2016. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Definitions and Acronyms . . . . . . . . . . . . . . . . 3 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 2. Model Structure . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. RIB Capability . . . . . . . . . . . . . . . . . . . . . 7 2.2. Routing Instance and Rib . . . . . . . . . . . . . . . . 7 2.3. Route . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4. Nexthop . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5. RPC Operations . . . . . . . . . . . . . . . . . . . . .1413 2.6. Notifications . . . . . . . . . . . . . . . . . . . . . . 16 3. YANG Modules . . . . . . . . . . . . . . . . . . . . . . . .1817 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . .5859 5. Security Considerations . . . . . . . . . . . . . . . . . . .5859 6. Contributors . . . . . . . . . . . . . . . . . . . . . . . .5859 7. References . . . . . . . . . . . . . . . . . . . . . . . . .5960 7.1. Normative References . . . . . . . . . . . . . . . . . .5960 7.2. Informative References . . . . . . . . . . . . . . . . .5960 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . .5960 1. Introduction The Interface to the Routing System (I2RS) [I-D.ietf-i2rs-architecture] provides read and write access to the information and state within the routing process that exists inside the routing elements, this is achieved via the protocol message exchange between I2RS clients and I2RS agents associated with the routing system. One of the functions of I2RS is to read and write data of Routing Information Base (RIB). [I-D.ietf-i2rs-usecase-reqs-summary] introduces a set of RIB use cases and the RIB information model is defined in [I-D.ietf-i2rs-rib-info-model]. This document defines a YANG [RFC6020][RFC6991] data model for the RIB that satisfies the RIB use cases and aligns with the RIB information model. 1.1. Definitions and Acronyms RIB: Routing Information Base Information Model (IM): An abstract model of a conceptual domain, independent of a specific implementation or data representation. 1.2. Tree Diagrams A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is as follows: o Brackets "[" and "]" enclose list keys. o Abbreviations before data node names: "rw" means configuration (read-write) and "ro" state data (read-only). o Symbols after data node names: "?" means an optional node and "*" denotes a "list" and "leaf-list". o Parentheses enclose choice and case nodes, and case nodes are also marked with a colon (":"). o Ellipsis ("...") stands for contents of subtrees that are not shown. 2. Model Structure The following figure shows an overview of structure tree of the i2rs- rib module. To give a whole view of the structure tree, some details of the tree are omitted. The detail are introduced in the following sub-sections. module:i2rs-ribietf-i2rs-rib +--rw routing-instance +--rw name string +--rw interface-list* [name] | +--rw name if:interface-ref +--rw router-id? yang:dotted-quad +--rw lookup-limit? uint8 +--rw rib-list* [name] +--rw name string +--rw rib-family rib-family-def +--rwenable-ip-rpf-check?ip-rpf-check? boolean +--rw route-list* [route-index] +--rw route-index uint64 +--rwroute-type route-type-def +--rwmatch | +--rw(rib-route-type)?(route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) | | ... | +--:(interface-route) | ... +--rw nexthop | +--rw nexthop-id uint32 | +--rw sharing-flag boolean | +--rw (nexthop-type)? | +--:(nexthop-base) | | ... | +--:(nexthop-chain) {nexthop-chain}? | | ... |+--:(nexthop-protection) {nexthop-protection}?+--:(nexthop-replicates) {nexthop-replicates}? | | ... |+--:(nexthop-load-balance) {nexthop-load-balance}?+--:(nexthop-protection) {nexthop-protection}? | | ... |+--:(nexthop-replicates) {nexthop-replicates}?+--:(nexthop-load-balance) {nexthop-load-balance}? | ... +--rw route-statistic | ... +--rw route-attributes | ... +--rw route-vendor-attributes rpcs: +---x rib-add | +--ro input | | +--ro rib-name string | | +--ro rib-family rib-family-def | | +--roenable-ip-rpf-check?ip-rpf-check? boolean | +--ro output | +--ro result boolean +---x rib-delete | +--ro input | | +--ro rib-name string | +--ro output | +--ro result boolean +---x route-add | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-delete | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-update | +--ro input | | +--ro rib-name string | | +--ro (match-conditions)? | | +--:(match-route-prefix) | | | ... | | +--:(match-route-attributes) | | | ... | | +--:(match-route-vendor-attributes) {...vendor-attributes}? | | | ... | | +--:(match-nexthop) | | ... | +--ro output | +--ro result boolean +---x nh-add | +--ro input | | +--ro rib-name string | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | |+--:(nexthop-protection) {nexthop-protection}?+--:(nexthop-replicates) {nexthop-replicates}? | | | ... | |+--:(nexthop-load-balance) {nexthop-load-balance}?+--:(nexthop-protection) {nexthop-protection}? | | | ... | |+--:(nexthop-replicates) {nexthop-replicates}?+--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro output | +--ro result boolean | +--ro nexthop-id uint32 +---x nh-delete +--ro input | +--ro rib-name string | +--ro(nexthop-context-or-id)?nexthop-id uint32 | +--ro sharing-flag boolean | +--ro (nexthop-type)? |+--:(nexthop-context)+--:(nexthop-base) | | ... |+--:(nexthop-identifier)+--:(nexthop-chain) {nexthop-chain}? |+--ro nexthop-identifer uint32| ... | +--:(nexthop-replicates) {nexthop-replicates}? | | ... | +--:(nexthop-protection) {nexthop-protection}? | | ... | +--:(nexthop-load-balance) {nexthop-load-balance}? | ... +--ro output +--ro result boolean notifications: +---n nexthop-resolution-status-change | +--ro nexthop | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | |+--:(nexthop-protection) {nexthop-protection}?+--:(nexthop-replicates) {nexthop-replicates}? | | | ... | |+--:(nexthop-load-balance) {nexthop-load-balance}?+--:(nexthop-protection) {nexthop-protection}? | | | ... | |+--:(nexthop-replicates) {nexthop-replicates}?+--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro nexthop-state nexthop-state-def +---n route-change +--ro rib-name string +--ro rib-family rib-family-def +--ro route-index uint64 +--roroute-type route-type-def +--romatch | +--ro(rib-route-type)?(route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) | | ... | +--:(interface-route) | ... +--ro route-installed-state route-installed-state-def +--ro route-state route-state-def +--roroute-reasonroute-change-reason route-reason-def Figure 1: Overview of I2RS Rib Module Structure 2.1. RIB Capability RIB capability negotiation is very important because not all of the hardware will be able to support all kinds of nexthops and there should be a limitation on how many levels of lookup can be practically performed. Therefore, a RIB data model MUST specify a way for an external entity to learn about the functional capabilities of a network device. At the same time, nexthop chains can be used to specify multiple headers over a packet, before that particular packet is forwarded. Not every network device will be able to support all kinds of nexthop chains along with the arbitrary number of headers which are chained together. The RIB data model MUST provide a way to expose the nexthop chaining capability supported by a given network device. This module uses the feature and if-feature statements to achieve above capability negotiation. 2.2. Routing Instance and Rib A routing instance, in the context of the RIB information model, is a collection of RIBs, interfaces, and routing protocol parameters. A routing instance creates a logical slice of the router and can allow multiple different logical slices; across a set of routers; to communicate with each other. And the routing protocol parameters control the information available in the RIBs. More detail about routing instance can be found in Section 2.2 of [I-D.ietf-i2rs-rib-info-model]. As described in [I-D.ietf-i2rs-rib-info-model], there will be multiple routing instances for a router. At the same time, for a routing instance, there would be multiple RIBs as well. Therefore, this model uses "list" to express the RIBs. The structure tree is shown as following figure. +--rw routing-instance +--rw name string +--rw interface-list* [name] | +--rw name if:interface-ref +--rw router-id? yang:dotted-quad +--rw lookup-limit? uint8 +--rw rib-list* [name] +--rw name string +--rw rib-family rib-family-def +--rwenable-ip-rpf-check?ip-rpf-check? boolean +--rw route-list* [route-index] ... (refer toSec.2.3)Section 2.3) Figure 2: Routing Instance Stuture 2.3. Route A route is essentially a match condition and an action following that match. The match condition specifies the kind of route (e.g., IPv4, MPLS, MAC, Interface etc.) and the set of fields to match on. According to the definition in [I-D.ietf-i2rs-rib-info-model], a route MUST associate with the following attributes: o ROUTE_PREFERENCE: See Section 2.3 of [I-D.ietf-i2rs-rib-info-model]. o ACTIVE: Indicates whether a route is fully resolved and is a candidate for selection. o INSTALLED: Indicates whether the route got installed in the FIB. In addition, a route can associate with one or more optional route attributes(e.g., route-vendor-attributes). For a RIB, there will have a number of routes, so the routes are expressed as a list under the rib list. +--rw route-list* [route-index] +--rw route-index uint64 +--rwroute-type route-type-def +--rwmatch | +--rw(rib-route-type)?(route-type)? | +--:(ipv4) | | +--rw ipv4 | | +--rwipv4-route-type match-ip-route-type-def | | +--rw (match-ip-route-type)?(ip-route-match-type)? | | +--:(dest-ipv4-address) | | | ... | | +--:(src-ipv4-address) | | | ... | | +--:(dest-src-ipv4-address) | | ... | +--:(ipv6) | | +--rw ipv6 | | +--rwipv6-route-type match-ip-route-type-def | | +--rw (match-ip-route-type)?(ip-route-match-type)? | | +--:(dest-ipv6-address) | | | ... | | +--:(src-ipv6-address) | | | ... | | +--:(dest-src-ipv6-address) | | ... | +--:(mpls-route) | | +--rw mpls-label uint32 | +--:(mac-route) | | +--rw mac-address uint32 | +--:(interface-route) | +--rw interface-identifier if:interface-ref +--rw nexthop | ...(refer toSec.2.4)Section 2.4) Figure 3: Routes Structure 2.4. Nexthop A nexthop represents an object resulting from a route lookup. As illustrated in Section 2.4 of [I-D.ietf-i2rs-rib-info-model], to support various of use cases (e.g., load balance, protection, multicast or the combination of them), the nexthop is modelled as a multi-level structure and supports recursion. The first level of the nexthop includes the following four types: o Base: The "base" nexthop itself is a hierarchical structure, it is the base of all other nexthop types. The first level of the base nexthop includes special-nexthop and nexthop-chain. The nexthop- chain can have one or more nexthop chain members, each member is one of the four types (as listed below) of specific nexthop. Other first level nexthop (e.g., load-balance, protection and replicate) will finally be iterated to a "base" nexthop. * nexthop-id * egress-interface * logical-tunnel * tunnel-encap o Load-balance: Designed for load-balance case where it normally will have multiple weighted nexthops. o Protection: Designed for protection scenario where it normally will have primary and standby nexthop. o Replicate: Designed for multiple destinations forwarding. The structure tree of nexthop is shown in the following figures. +--rw nexthop | +--rw nexthop-id uint32 | +--rw sharing-flag boolean | +--rw (nexthop-type)? | +--:(nexthop-base) | | ...(refer to Figure 5) | +--:(nexthop-chain) {nexthop-chain}? | | +--rw nexthop-chain | | +--rwnexthop-chain* [nexthop-chain-member-id]nexthop-list* [nexthop-member-id] | | +--rwnexthop-chain-member-idnexthop-member-id uint32 |+--:(nexthop-protection) {nexthop-protection}?+--:(nexthop-replicates) {nexthop-replicates}? | | +--rwnexthop-protectionnexthop-replicates | | +--rwnexthop-protection-list* [...-member-id]nexthop-list* [nexthop-member-id] | | +--rwnexthop-protection-member-idnexthop-member-id uint32 || +--rw nexthop-preference nexthop-preference-def | +--:(nexthop-load-balance) {nexthop-load-balance}?+--:(nexthop-protection) {nexthop-protection}? | | +--rwnexthop-lbnexthop-protection | | +--rwnexthop-lbs* [nexthop-lbs-member-id]nexthop-list* [nexthop-member-id] | | +--rwnexthop-lbs-member-idnexthop-member-id uint32 | | +--rwnhop-lb-weight nhop-lb-weight-defnexthop-preference nexthop-preference-def |+--:(nexthop-replicates) {nexthop-replicates}?+--:(nexthop-load-balance) {nexthop-load-balance}? | +--rwnexthop-replicatesnexthop-lbs | +--rwnexthop-replicates* [nexthop-replicates-member-id]nexthop-list* [nexthop-member-id] | +--rwnexthop-replicates-member-idnexthop-member-id uint32 | +--rw nexthop-lb-weight nexthop-lb-weight-def Figure 4: Nexhop Structure Figure65 (as shown blow) is a sub-tree of nexthop, it's under the nexthop base node. +--:(nexthop-base) | +--rw nexthop-base | +--rw (nexthop-base-type)? | +--:(special-nexthop) | | +--rw special? special-nexthop-def | +--:(egress-interface-nexthop) | | +--rw outgoing-interface if:interface-ref | +--:(ipv4-address-nexthop) | | +--rw ipv4-address inet:ipv4-address | +--:(ipv6-address-nexthop) | | +--rw ipv6-address inet:ipv6-address | +--:(egress-interface-ipv4-nexthop) | | +--rw egress-interface-ipv4-address | | +--rw outgoing-interface if:interface-ref | | +--rw ipv4-address inet:ipv4-address | +--:(egress-interface-ipv6-nexthop) | | +--rw egress-interface-ipv6-address | | +--rw outgoing-interface if:interface-ref | | +--rw ipv6-address inet:ipv6-address | +--:(egress-interface-mac-nexthop) | | +--rw egress-interface-mac-address | | +--rw outgoing-interface if:interface-ref | | +--rw ieee-mac-address uint32 | +--:(tunnel-encap-nexthop) {nexthop-tunnel}? | | +--rw tunnel-encap | | +--rw (tunnel-type)? | | +--:(ipv4) {ipv4-tunnel}? | | | +--rwsource-ipv4-addresssrc-ipv4-address inet:ipv4-address | | | +--rwdestination-ipv4-addressdest-ipv4-address inet:ipv4-address | | | +--rw protocol uint8 | | | +--rw ttl? uint8 | | | +--rw dscp? uint8 | | +--:(ipv6) {ipv6-tunnel}? | | | +--rwsource-ipv6-addresssrc-ipv6-address inet:ipv6-address | | | +--rwdestination-ipv6-addressdest-ipv6-address inet:ipv6-address | | | +--rw next-header uint8 | | | +--rw traffic-class? uint8 | | | +--rw flow-label? uint16 | | | +--rw hop-limit? uint8 | | +--:(mpls) {mpls-tunnel}? | | | +--rw(mpls-action-type)?label-operations* [label-oper-id] | | | +--rw label-oper-id uint32 | | | +--rw (label-actions)? | | |+--:(mpls-push)+--:(label-push) | | | | +--rwmpls-push booleanlabel-push | | | | +--rwmpls-labellabel uint32 | | | | +--rw s-bit? boolean | | | | +--rw tc-value? uint8 | | | | +--rw ttl-value? uint8 | | |+--:(mpls-swap)+--:(label-swap) | | | +--rwmpls-swap booleanlabel-swap | | | +--rwmpls-in-labelin-label uint32 | | | +--rwmpls-out-labelout-label uint32 | | | +--rw ttl-action? ttl-action-def | | +--:(gre) {gre-tunnel}? | | | +--rwgre-ip-destination inet:ipv4-address(dest-address-type)? | | | | +--:(ipv4) | | | | | +--rwgre-protocol-typeipv4-dest inet:ipv4-address | | | | +--:(ipv6) | | | | +--rw ipv6-dest inet:ipv6-address | | | +--rw protocol-type uint16 | | | +--rwgre-key?key? uint64 | | +--:(nvgre) {nvgre-tunnel}? | | | +--rw (nvgre-type)? | | | | +--:(ipv4) | | | | | +--rw src-ipv4-address inet:ipv4-address | | | | | +--rw dest-ipv4-address inet:ipv4-address | | | | | +--rw protocol uint8 | | | | | +--rw ttl? uint8 | | | | | +--rw dscp? uint8 | | | | +--:(ipv6) | | | | +--rwsource-ipv6-addresssrc-ipv6-address inet:ipv6-address | | | | +--rw dest-ipv6-address inet:ipv6-address | | | | +--rw next-header uint8 | | | | +--rw traffic-class? uint8 | | | | +--rw flow-label? uint16 | | | | +--rw hop-limit? uint8 | | | +--rw virtual-subnet-id uint32 | | | +--rw flow-id? uint16 | | +--:(vxlan) {vxlan-tunnel}? | | +--rw (vxlan-type)? | | | +--:(ipv4) | | | | +--rw src-ipv4-address inet:ipv4-address | | | | +--rw dest-ipv4-address inet:ipv4-address | | | | +--rw protocol uint8 | | | | +--rw ttl? uint8 | | | | +--rw dscp? uint8 | | | +--:(ipv6) | | | +--rw src-ipv6-address inet:ipv6-address | | | +--rw dest-ipv6-address inet:ipv6-address | | | +--rw next-header uint8 | | | +--rw traffic-class? uint8 | | | +--rw flow-label? uint16 | | | +--rw hop-limit? uint8 | | +--rwvxlan-identifier?vxlan-identifier uint32 | +--:(tunnel-decap-nexthp) {nexthop-tunnel}? | | +--rw tunnel-decap | | +--rw (tunnel-type)? | | +--:(ipv4) {ipv4-tunnel}? | | | +--rw ipv4-decap | | | +--rw ipv4-decapbooleantunnel-decap-action-def | | | +--rw ttl-action? ttl-action-def | | +--:(ipv6) {ipv6-tunnel}? | | | +--rw ipv6-decap | | | +--rw ipv6-decapbooleantunnel-decap-action-def | | | +--rw hop-limit-action? hop-limit-action-def | | +--:(mpls) {mpls-tunnel}? | | +--rwmpls-poplabel-pop | | +--rwmpls-pop booleanlabel-pop mpls-label-action-def | | +--rw ttl-action? ttl-action-def | +--:(logical-tunnel-nexthop) {nexthop-tunnel}? | | +--rw logical-tunnel | | +--rw tunnel-type tunnel-type-def | | +--rw tunnel-name string | +--:(rib-name-nexthop) | +--rw rib-name? string Figure 5: Nexthop Base Structure 2.5. RPC Operations This module defines the following RPC operations: o rib-add: It is defined to add a rib to a routing instance. A name of the rib, address family of the rib and whether the RPF check is enabled are passed as the input parameters. The output is the result of the add operation: 1 means success, and 0 means failed. o rib-delete: It is defined to delete a rib from a routing instance. When a rib is deleted, all routes installed in the rib will be deleted. A name of the rib is passed as the input parameter. The output is the result of the delete operation: 1 means success, and 0 means failed. o route-add: It is defined to add a route or a set of routes to a rib. A rib name, the route prefix(es), route attributes, route vendor attributes and nexthop are passed as the input parameters. The output is the result of the add operation: 1 means success, and 0 means failed. Before calling the route-add rpc, it is required to call the nh-add rpc to create and/or return the nexthop identifier. o route-delete: It is defined to delete a route or a set of routes from a rib. A name of the rib and the route prefix(es) are passed as the input parameters. The output is the result of the delete operation: 1 means success, and 0 means failed. o route-update: It is defined to update a route or a set of routes. A rib name, the route prefix(es), or route attributes, or route vendor attributes, or nexthop are passed as the input parameters. The match conditions can be either route prefix(es), or route attributes, or route vendor attributes, or nexthop. The update actions include: update the nexthop, update the route attributes, update the route vendor attributes. The output is the result of the update operation: 1 means success, and 0 means failed. o nh-add: It is defined to add a nexthop to a rib. A name of the rib and a nexthop are passed as the input parameters. The network node is required to allocate a nexhop identifier to the nexthop. The outputs include the result of the update operation (1 means success, and 0 means failed ) and the nexthop identifier that is allocated to the nexthop. o nh-delete: It is defined to delete a nexthop from a rib. A name of a rib and a nexthop or nexthop identifier are passed as the input parameters. The output is the result of the delete operation: 1 means success, 0 means failed. The structure tree of rpcs is showing in following figure. rpcs: +---x rib-add | +--ro input | | +--ro rib-name string | | +--ro rib-family rib-family-def | | +--roenable-ip-rpf-check?ip-rpf-check? boolean | +--ro output | +--ro result boolean +---x rib-delete | +--ro input | | +--ro rib-name string | +--ro output | +--ro result boolean +---x route-add | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-delete | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-update | +--ro input | | +--ro rib-name string | | +--ro (match-conditions)? | | +--:(match-route-prefix) | | | ... | | +--:(match-route-attributes) | | | ... | |+--:(match-vendor-route-attributes)+--:(match-route-vendor-attributes) {..vendor-attributes}? | | | ... | | +--:(match-nexthop) | | ... | +--ro output | +--ro result boolean +---x nh-add | +--ro input | | +--ro rib-name string | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | ... | +--ro output | +--ro result boolean | +--ro nexthop-id uint32 +---x nh-delete +--ro input | +--ro rib-name string | +--ro(nexthop-context-or-id)? | +--:(nexthop-context) |nexthop-id uint32 |...+--ro sharing-flag boolean |+--:(nexthop-identifier)+--ro (nexthop-type)? | ... +--ro output +--ro result boolean Figure 6: RPCs Structure 2.6. Notifications Asynchronous notifications are sent by the RIB manager of a network device to an external entity when some event triggers on the network device. A RIB data-model MUST support sending 2 kind of asynchronous notifications. 1. Route change notification: o Installed (Indicates whether the route got installed in the FIB) ; o Active (Indicates whether a route is fully resolved and is a candidate for selection) ; o Reason - E.g. Not authorized 2. Nexthop resolution status notification Nexthops can be fully resolved nexthops or an unresolved nexthop. A resolved nexthop has adequate level of information to send the outgoing packet towards the destination by forwarding it on an interface of a directly connected neighbor. An unresolved nexthop is something that requires the RIB manager to determine the final resolved nexthop. For example, in a case when a nexthop could be an IP address. The RIB manager would resolve how to reach that IP address, e.g. by checking if that particular IP is address reachable by regular IP forwarding or by a MPLS tunnel or by both. If the RIB manager cannot resolve the nexthop, then the nexthop remains in an unresolved state and is NOT a suitable candidate for installation in the FIB. The structure tree of notifications is shown in the following figure. notifications: +---n nexthop-resolution-status-change | +--ro nexthop | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | |+--:(nexthop-protection) {nexthop-protection}?+--:(nexthop-replicates) {nexthop-replicates}? | | | ... | |+--:(nexthop-load-balance) {nexthop-load-balance}?+--:(nexthop-protection) {nexthop-protection}? | | | ... | |+--:(nexthop-replicates) {nexthop-replicates}?+--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro nexthop-state nexthop-state-def +---n route-change +--ro rib-name string +--ro rib-family rib-family-def +--ro route-index uint64 +--roroute-type route-type-def +--romatch | +--ro(rib-route-type)?(route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) | | ... | +--:(interface-route) | ... +--ro route-installed-state route-installed-state-def +--ro route-state route-state-def +--roroute-reasonroute-change-reason route-reason-def Figure 7: Notifications Structure 3. YANG Modules //<CODE BEGINS> file"i2rs rib@2015-10-17.yang""ietf i2rs rib@2015-10-28.yang" modulei2rs-ribietf-i2rs-rib { namespace"urn:ietf:params:xml:ns:yang:i2rs-rib";"urn:ietf:params:xml:ns:yang:ietf-i2rs-rib"; // replace with iana namespace when assigned prefix"i2rs-rib";"iir"; import ietf-inet-types { prefix inet; //rfc6991 } import ietf-interfaces { prefix "if"; } import ietf-yang-types { prefix yang; } organization "IETF I2RSWG";(Interface to Routing System) Working Group"; contact"email: wang_little_star@sina.com email: hari@packetdesign.com email: mach.chen@huawei.com email: amit.dass@ericsson.com email: sriganesh.kini@ericsson.com email: nitin_bahadur@yahoo.com";"WG Web: <http://tools.ietf.org/wg/i2rs/> WG List: <mailto:i2rs@ietf.org> WG Chair: Susan Hares <mailto:shares@ndzh.com> WG Chair: Jeffrey Haas <mailto:jhaas@pfrc.org> Editor: Lixing Wang <mailto:wang_little_star@sina.com> Editor: Hariharan Ananthakrishnan <mailto:hari@packetdesign.com> Editor: Mach(Guoyi) Chen <mailto:mach.chen@huawei.com> Editor: Amit Dass <mailto:amit.dass@ericsson.com> Editor: Sriganesh Kini <mailto:sriganesh.kini@ericsson.com> Editor: Nitin Bahadur <mailto:nitin_bahadur@yahoo.com>"; description "This module defines a YANG data model for Routing Information Base (RIB) that aligns with the I2RS RIB information model."; revision"2015-10-17""2015-10-28" { description "initial revision"; reference"draft-ietf-i2rs-rib-info-model-07";"draft-ietf-i2rs-rib-info-model-08"; }//Nexthhop related features//Features feature nexthop-tunnel { description "This feature means that a node support tunnel nexhtopcapability. The i2rs client can specify a tunnel nexthop to a route.";capability."; } feature nexthop-chain { description "This feature means that a node support chain nexhtop capability."; } feature nexthop-protection { description "This feature means that a node support protection nexhtop capability."; } feature nexthop-replicates { description "This feature means that a node support relicates nexhtop capability."; } feature nexthop-load-balance { description "This feature means that a node support load balance nexhtop capability."; }//Tunnel encap related featuresfeature ipv4-tunnel { description "This feature means that a node support IPv4 tunnel encapsulation capability."; } feature ipv6-tunnel { description "This feature means that a node support IPv6 tunnel encapsulation capability."; } feature mpls-tunnel { description "This feature means that a node support MPLS tunnel encapsulation capability."; } feature vxlan-tunnel { description "This feature means that a node support VxLAN tunnel encapsulation capability."; } feature gre-tunnel { description "This feature means that a node support GRE tunnel encapsulation capability."; } feature nvgre-tunnel { description "This feature means that a node support NvGRE tunnel encapsulation capability."; } feature route-vendor-attributes { description "This feature means that a node support route vendor attributes."; } //Identities and Type Definitions identitympls-actionmpls-label-action { description "Base identify from which all mpls label operations are derived. The MPLS label stack operations include: push - to add a new label to a label stack, pop - to pop the top label from a label stack, swap - to change the top label of a label stack with new label."; } identity label-push { base"mpls-action";"mpls-label-action"; description "MPLS label stack operation: push."; } identity label-pop { base"mpls-action";"mpls-label-action"; description "MPLS label stack operation: pop."; } identity label-swap { base"mpls-action";"mpls-label-action"; description "MPLS label stack operation: swap."; } typedefmpls-action-defmpls-label-action-def { type identityref { base"mpls-action";"mpls-label-action"; } description "MPLS label action def."; } identityttl-actiontunnel-decap-action { description "Base identify from which allTTLtunnel decap actions are derived. Tunnel decap actions include: ipv4-decap - to decap an IPv4 tunnel, ipv6-decap - to decap an IPv6 tunnel."; } identity ipv4-decap { base "tunnel-decap-action"; description "IPv4 tunnel decap."; } identity ipv6-decap { base "tunnel-decap-action"; description "IPv4 tunnel decap."; } typedef tunnel-decap-action-def { type identityref { base "tunnel-decap-action"; } description "Tunnel decap def."; } identity ttl-action { description "Base identify from which all TTL actions are derived. The tll actions include: - ttl-no-action: do nothing regarding the TTL, or - ttl-copy-to-inner: copy the TTL of the outer header to inner header, or - ttl-decrease-and-copy-to-inner: Decrease the TTL by one and copy it to innerheader. ";header."; } identityttl-no-actionno-action { base "ttl-action"; description "Do nothing regarding the TTL."; } identityttl-copy-to-innercopy-to-inner { base "ttl-action"; description "Copy the TTL of the outer header to inner header."; } identityttl-decrease-and-copy-to-innerdecrease-and-copy-to-inner { base "ttl-action"; description "Decrease TTL by one and copy the TTL to inner header."; } identity decrease-and-copy-to-next { base "ttl-action"; description "Decrease TTL by one and copy the TTL to the next header.For example: when MPLS label swapping, decrease the TTL of the in label and copy it to the out label."; } typedef ttl-action-def { type identityref { base "ttl-action"; } description "TTL action def."; } identity hop-limit-action { description "Base identify from which all hop limit actions are derived."; } identity hop-limit-no-action { base "hop-limit-action"; description "Do nothing regarding the hop limit."; } identity hop-limit-copy-to-inner { base "hop-limit-action"; description "Copy the hop limit of the outer header to inner header."; } typedef hop-limit-action-def { type identityref { base "hop-limit-action"; } description "IPv6 hop limit action def."; } identity special-nexthop { description "Base identify from which all special nexthops are derived."; } identity discard { base "special-nexthop"; description "This indicates that the network device should drop the packet and increment a drop counter."; } identity discard-with-error { base "special-nexthop"; description "This indicates that the network device should drop the packet, increment a drop counter and send back an appropriate error message (like ICMP error)."; } identity receive { base "special-nexthop"; description "This indicates that that the traffic is destined for the network device. For example, protocol packets or OAM packets. All locally destined traffic SHOULD be throttled to avoid a denial of service attack on the router's control plane. An optional rate-limiter can be specified to indicate how to throttle traffic destined for the control plane."; } identity cos-value { base "special-nexthop"; description "Cos-value special nexthop."; } typedef special-nexthop-def { type identityref { base "special-nexthop"; } description "Special nexthop def."; } identitymatch-ip-route-typeip-route-match-type { description "Base identify from which all route match types are derived. Route match type could be: match source, or match destination, or match source and destination."; } identity match-ip-src { base"match-ip-route-type";"ip-route-match-type"; description "Source route match type."; } identity match-ip-dest { base"match-ip-route-type";"ip-route-match-type"; description "Destination route match type"; } identity match-ip-src-dest { base"match-ip-route-type";"ip-route-match-type"; description "Src and Dest route match type"; } typedefmatch-ip-route-type-defip-route-match-type-def { type identityref { base"match-ip-route-type";"ip-route-match-type"; } description"Route"IP route match type def."; } identity rib-family { description "Base identify from which all rib address families are derived."; } identity ipv4-rib-family { base "rib-family"; description "IPv4 rib address family."; } identity ipv6-rib-family { base "rib-family"; description "IPv6 rib address family."; } identity mpls-rib-family { base "rib-family"; description "MPLS rib address family."; } identity ieee-mac-rib-family { base "rib-family"; description "MAC rib address family."; } typedef rib-family-def { type identityref { base "rib-family"; } description "Rib address family def."; } identity route-type { description "Base identify from which all route types are derived."; } identity ipv4-route { base "route-type"; description "IPv4 route type."; } identity ipv6-route { base "route-type"; description "IPv6 route type."; } identity mpls-route { base "route-type"; description "MPLS route type."; } identity ieee-mac { base "route-type"; description "MAC route type."; } identity interface { base "route-type"; description "Interface route type."; } typedef route-type-def { type identityref { base "route-type"; } description "Route type def."; } identity tunnel-type { description "Base identify from which all tunnel types are derived."; } identity ipv4-tunnel { base "tunnel-type"; description "IPv4 tunnel type"; } identity ipv6-tunnel { base "tunnel-type"; description "IPv6 Tunnel type"; } identity mpls-tunnel { base "tunnel-type"; description "MPLS tunnel type"; } identity gre-tunnel { base "tunnel-type"; description "GRE tunnel type"; } identity vxlan-tunnel { base "tunnel-type"; description "VxLAN tunnel type"; } identity nvgre-tunnel { base "tunnel-type"; description "NVGRE tunnel type"; } typedef tunnel-type-def { type identityref { base "tunnel-type"; } description "Tunnel type def."; } identity route-state { description "Base identify from which all route states are derived."; } identity active { base "route-state"; description "Active state."; } identity inactive { base "route-state"; description "Inactive state."; } typedef route-state-def { type identityref { base "route-state"; } description "Route state def."; } identity nexthop-state { description "Base identify from which all nexthop states are derived."; } identity resolved { base "nexthop-state"; description "Reolved nexthop state."; } identity unresolved { base "nexthop-state"; description "Unresolved nexthop state."; } typedef nexthop-state-def { type identityref { base "nexthop-state"; } description "Nexthop state def."; } identity route-installed-state { description "Base identify from which all route installed states are derived."; } identity uninstalled { base "route-installed-state"; description "Uninstalled state."; } identity installed { base "route-installed-state"; description "Installed state."; } typedef route-installed-state-def { type identityref { base "route-installed-state"; } description "Route installed state def."; } identity route-reason { description "Base identify from which all route reasons are derived."; } identity low-preference { base "route-reason"; description "Low preference"; } identity unresolved-nexthop { base "route-reason"; description "Unresolved nexthop"; } identity higher-metric { base "route-reason"; description "Higher metric"; } typedef route-reason-def { type identityref { base "route-reason"; } description "Route reason def."; } typedef nexthop-preference-def { type uint8 { range "1..99"; } description "Nexthop-preference is used for protection schemes. It is an integer value between 1 and 99. A lower value indicates higher preference. To download a primary/standby/tertiary group to the FIB, the nexthops that are resolved and have two highest preferences are selected."; } typedefnhop-lb-weight-defnexthop-lb-weight-def { type uint8 { range "1..99"; } description "Nhop-lb-weight is a number between 1 and 99."; } //Groupings grouping route-prefix { description "The common attributes used for all types of route prefix."; leaf route-index { type uint64 ; mandatory true; description "Route index."; }leaf route-type { type route-type-def; mandatory true; description "Route types, e.g., IPv4, IPv6, MPLS, MAC etc. route types."; }container match { description "The match condition specifies the kind of route (IPv4, MPLS, etc.) and the set of fields to match on."; choicerib-route-typeroute-type { description"To match a route according to rib route type.";"Route types: IPv4, IPv6, MPLS, MAC etc."; case ipv4 { description "IPv4ribroute case."; container ipv4 { description "IPv4 routematch type."; leaf ipv4-route-typematch."; choice ip-route-match-type {type match-ip-route-type-def; mandatory true;description"Route"IP route matchtype, it could be:type options: match source, or match destination, or match source anddestination. "; } choice match-ip-route-type { description "To match a route according to match type.";destination."; case dest-ipv4-address { leaf dest-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description"To match an"An IPv4 destinationaddress.";address as the match."; } } case src-ipv4-address { leaf src-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description"To match an"An IPv4 sourceaddress.";address as the match."; } } case dest-src-ipv4-address { container dest-src-ipv4-address { description"To match"A combination of an IPv4 source and an IPv4 destinationaddreses.";address as the match."; leaf dest-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description "The IPv4 destination address of thematch condition.";match."; } leaf src-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description "The IPv4 source address of thematch condition.";match"; } } } } } } case ipv6 { description "IPv6ribroute case."; container ipv6 { description "IPv6 routematch type."; leaf ipv6-route-typematch."; choice ip-route-match-type {type match-ip-route-type-def; mandatory true;description"Route"IP route matchtype, it could be:type options: match source, or match destination, or match source anddestination. "; } choice match-ip-route-type { description "To match a route according to match type.";destination."; case dest-ipv6-address { leaf dest-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description"To match an"An IPv6 destinationaddress.";address as the match."; } } case src-ipv6-address { leaf src-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description"To match an"An IPv6 sourceaddress.";address as the match."; } } case dest-src-ipv6-address { container dest-src-ipv6-address { description"To match the"A combination of an IPv6 source and an IPv6 destinationaddreses.";address as the match."; leaf dest-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "The IPv6 destination address of thematch condition.";match"; } leaf src-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "The IPv6 source address of thematch condition.";match."; } } } } } } case mpls-route { description "MPLSribroute case."; leaf mpls-label { type uint32 ; mandatory true; description "The label used for matching."; } } case mac-route { description "MAC rib case."; leaf mac-address { type uint32 ; mandatory true; description "The MAC address used for matching."; } } case interface-route { description "Interfaceribroute case."; leaf interface-identifier { type if:interface-ref; mandatory true; description "The interface used for matching."; } } } } } grouping route { description "The common attributes usesd for all types of route."; uses route-prefix; container nexthop { description "The nexthop of the route."; uses nexthop; } container route-statistic { description "The statistic information of the route."; leaf route-state { type route-state-def; config false; description "Indicate a route's state: Active or Inactive."; } leaf route-installed-state { type route-installed-state-def; config false; description "Indicate that a route's installed states: Installed or uninstalled."; } leaf route-reason { type route-reason-def; config false; description "Indicate the route reason."; } } container route-attributes { description "Route attributes."; uses route-attributes; } container route-vendor-attributes { description "Route vendor attributes."; uses route-vendor-attributes; } } groupingnexthop { description "The nexthop structure."; leaf nexthop-id { type uint32; mandatory true; description "The nexthop identifier of a nexthop."; } leaf sharing-flag { type boolean; mandatory true; description "To indicate whether a nexthop is sharable or non-sharable. 1 - means sharable 0 - means non-sharable."; } choice nexthop-type { description "Based on nexthop type to derive the nexthop."; case nexthop-base { container nexthop-base { description "A nexthop base container."; uses nexthop-base; } } case nexthop-chain { if-feature nexthop-chain; container nexthop-chainnexthop-list { description "A generic nexthopchain container.";list."; listnexthop-chainnexthop-list { key"nexthop-chain-member-id";"nexthop-member-id"; description "A list ofnexthop members of a load nexthop chain.";nexthop."; leafnexthop-chain-member-idnexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to a nexthopchainlist member. A nexthopchainlist member is a nexthop."; } } }} case nexthop-protection { if-feature nexthop-protection; container nexthop-protectiongrouping nexthop-list-p { description "Aprotectionnexthopcontainer.";listnexthop-protection-listwith preference parameter."; list nexthop-list { key"nexthop-protection-member-id";"nexthop-member-id"; description "A list ofnexthop protection members of a load balancenexthop."; leafnexthop-protection-member-idnexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to aprotectionnexthop list member. Aprotectionnexthop list member is a nexthop."; } leaf nexthop-preference { type nexthop-preference-def; mandatory true; description "Nexthop-preference is used for protection schemes. It is an integer value between 1 and 99. A lower value indicates higher preference. To download a primary/standby/tertiary group to the FIB, the nexthops that are resolved and have two highest preferences are selected."; } } }} case nexthop-load-balance { if-feature nexthop-load-balance; container nexthop-lbgrouping nexthop-list-w { description "Aload balancenexthopcontainer.";listnexthop-lbswith weight parameter."; list nexthop-list { key"nexthop-lbs-member-id";"nexthop-member-id"; description "A list ofnexthop load balance members of a load balancenexthop."; leafnexthop-lbs-member-idnexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to aload balancenexthop list member. Aload balancenexthop list member is a nexthop."; } leafnhop-lb-weightnexthop-lb-weight { typenhop-lb-weight-def;nexthop-lb-weight-def; mandatory true; description "The weight of a nexthop of the load balance nexthops."; } } } grouping nexthop { description "The nexthop structure."; leaf nexthop-id { type uint32; mandatory true; description "The nexthop identifier of a nexthop."; } leaf sharing-flag { type boolean; mandatory true; description "To indicate whether a nexthop is sharable or non-sharable. true - sharable, means the nexthop can be shared with other routes false - non-sharable, means the nexthop can not be shared with other routes."; } choice nexthop-type { description "Nexthop type options."; case nexthop-base { container nexthop-base { description "The base nexthop."; uses nexthop-base; } } case nexthop-chain { if-feature nexthop-chain; container nexthop-chain { description "A chain nexthop."; uses nexthop-list; } } case nexthop-replicates { if-feature nexthop-replicates; container nexthop-replicates { description "Anexthopreplicatescontainer."; list nexthop-replicatesnexthop."; uses nexthop-list; } } case nexthop-protection {key "nexthop-replicates-member-id"; description "A list of replicate nexthop members that belong to the nexthop-replicates."; leaf nexthop-replicates-member-idif-feature nexthop-protection; container nexthop-protection {type uint32;description "Anexthop identifier that points to a replicates nexthop member. A replicates nexthop member is aprotection nexthop."; uses nexthop-list-p; } } case nexthop-load-balance { if-feature nexthop-load-balance; container nexthop-lbs { description "A load balance nexthop."; uses nexthop-list-w; } } } } grouping nexthop-base { description "The basenexthop content for a route.";nexthop."; choice nexthop-base-type { description"Based on nexthop chain"Nexthop base typeto select relevant nexthop chain member.";options."; case special-nexthop { leaf special { type special-nexthop-def; description "A special nexthop."; } } case egress-interface-nexthop { leaf outgoing-interface { type if:interface-ref; mandatory true; description "The nexthop is an outgoing interface."; } } case ipv4-address-nexthop { leaf ipv4-address { type inet:ipv4-address; mandatory true; description "The nexthop is an IPv4 address."; } } case ipv6-address-nexthop { leaf ipv6-address { type inet:ipv6-address; mandatory true; description "The nexthop is an IPv6 address."; } } case egress-interface-ipv4-nexthop { container egress-interface-ipv4-address{ leaf outgoing-interface { type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ipv4-address { type inet:ipv4-address; mandatory true; description "The nexthop points to an interface with an IPv4 address."; } description"Egress-interface"The nexthop is an Egress-interface and an ipaddress: Thisaddress.This can be usesd in cases e.g.where the ip address is a link-local address."; } } case egress-interface-ipv6-nexthop { container egress-interface-ipv6-address { leaf outgoing-interface { type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ipv6-address { type inet:ipv6-address; mandatory true; description "The nexthop points to an interface with an IPv6 address."; } description"Egress-interface"The nexthop is an Egress-interface and an ipaddress: Thisaddress.This can be usesd in cases e.g.where the ip address is a link-local address."; } } case egress-interface-mac-nexthop { container egress-interface-mac-address { leaf outgoing-interface { type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ieee-mac-address { type uint32; mandatory true; description "The nexthop points to an interface with a specific mac-address."; } description "The egress interface must be an ethernet interface. Address resolution is not required for this nexthop."; } } case tunnel-encap-nexthop { if-feature nexthop-tunnel; container tunnel-encap { uses tunnel-encap; description "This can be an encap representing an IP tunnel or MPLS tunnel or others as defined in info model. An optional egress interface can be chained to the tunnel encap to indicate which interface to send the packet out on. The egress interface is useful when the network device contains Ethernet interfaces and one needs to perform address resolution for the IP packet."; } } case tunnel-decap-nexthp { if-feature nexthop-tunnel; container tunnel-decap { uses tunnel-decap; description "This is to specify decapsulating a tunnel header."; } } case logical-tunnel-nexthop { if-feature nexthop-tunnel; container logical-tunnel { uses logical-tunnel; description "This can be a MPLS LSP or a GRE tunnel (or others as defined in This document), that is represented by a unique identifier (e.g. name)."; } } case rib-name-nexthop { leaf rib-name { type string; description "A nexthop pointing to a rib indicates that the route lookup needs to continue in The specified rib. This is a way to perform chained lookups."; } } } } grouping route-vendor-attributes { description "Route vendor attributes."; } grouping logical-tunnel { description "A logical tunnel that is identified by a type and a tunnel name."; leaf tunnel-type { type tunnel-type-def; mandatory true; description "A tunnel type."; } leaf tunnel-name { type string; mandatory true; description "A tunnel name that points to a logical tunnel."; } } grouping ipv4-header { description "The IPv4 header encapsulation information."; leafsource-ipv4-addresssrc-ipv4-address { type inet:ipv4-address; mandatory true; description "The source ip address of the header."; } leafdestination-ipv4-addressdest-ipv4-address { type inet:ipv4-address; mandatory true; description "The destination ip address of the header."; } leaf protocol { type uint8; mandatory true; description "The protocol id of the header."; } leaf ttl { type uint8; description "The TTL of the header."; } leaf dscp { type uint8; description "The DSCP field of the header."; } } grouping ipv6-header { description "The IPv6 header encapsulation information."; leafsource-ipv6-addresssrc-ipv6-address { type inet:ipv6-address; mandatory true; description "The source ip address of the header."; } leafdestination-ipv6-addressdest-ipv6-address { type inet:ipv6-address; mandatory true; description "The destination ip address of the header."; } leaf next-header { type uint8; mandatory true; description "The next header of the IPv6 header."; } leaf traffic-class { type uint8; description "The traffic class value of the header."; } leaf flow-label { type uint16; description "The flow label of the header."; } leaf hop-limit { type uint8; description "The hop limit the header."; } } grouping nvgre-header { description "The NvGRE header encapsulation information."; choice nvgre-type { description "NvGRE can use eigher IPv4 or IPv6 header for encapsulation."; case ipv4 { uses ipv4-header; } case ipv6 { uses ipv6-header; } } leaf virtual-subnet-id { type uint32; mandatory true; description "The subnet identifier of the NvGRE header."; } leaf flow-id { type uint16; description "The flow identifier of the NvGRE header."; } } grouping vxlan-header { description "The VxLAN encapsulation header information."; choice vxlan-type { description "NvGRE can use eigher IPv4 or IPv6 header for encapsulation."; case ipv4 { uses ipv4-header; } case ipv6 { uses ipv6-header; } } leaf vxlan-identifier { type uint32; mandatory true; description "The VxLAN identifier of the VxLAN header."; } } grouping gre-header { description "The GRE encapsulation header information."; choice dest-address-type { description "GRE options: IPv4 and IPv6"; case ipv4 { leafgre-ip-destinationipv4-dest { type inet:ipv4-address; mandatory true; description "The destination ip address of the GRE header."; } } case ipv6 { leafgre-protocol-typeipv6-dest { typeinet:ipv4-address;inet:ipv6-address; mandatory true; description "The destination ip address of the GRE header."; } } } leaf protocol-type { type uint16; mandatory true; description "The protocol type of the GRE header."; } leafgre-keykey { type uint64; description "The GRE key of the GRE header."; } } grouping mpls-header { description "The MPLS encapsulation header information.";choice mpls-action-typelist label-operations { key "label-oper-id"; description"Based on action type to perform different operation."; case mpls-push {"Label operations."; leafmpls-pushlabel-oper-id { typeboolean; mandatory true;uint32; description"Push a MPLS label"An optional identifier that points tothea labelstack.";operation."; } choice label-actions { description "Label action options."; case label-push { container label-push { description "Label push operation."; leafmpls-labellabel { type uint32; mandatory true; description "TheMPLSlabel to be pushed."; } leaf s-bit { type boolean; description "The s-bit of the label to be pushed. "; } leaf tc-value { type uint8; description "The traffic class value of the label to be pushed."; } leaf ttl-value { type uint8; description "The TTL value of the label to to be pushed."; } } } casempls-swaplabel-swap {leaf mpls-swapcontainer label-swap {type boolean; mandatory true;description"Swap a MPLS label with another label."; }"Label swap operation."; leafmpls-in-labelin-label { type uint32; mandatory true; description "Thein MPLS label.";label to be swapped."; } leafmpls-out-labelout-label { type uint32; mandatory true; description "The out MPLS label."; } leaf ttl-action { type ttl-action-def; description "The label ttl actions: - No-action, or - Copy to inner label,or - Decrease (the in label) by 1 and copy to the out label."; } } } } } } grouping tunnel-encap{ description "Tunnel encapsulation inforamtion."; choice tunnel-type { description "Tunnel options for next-hops."; case ipv4 { if-feature ipv4-tunnel; uses ipv4-header; } case ipv6 { if-feature ipv6-tunnel; uses ipv6-header; } case mpls { if-feature mpls-tunnel; uses mpls-header; } case gre { if-feature gre-tunnel; uses gre-header; } case nvgre { if-feature nvgre-tunnel; uses nvgre-header; } case vxlan { if-feature vxlan-tunnel; uses vxlan-header; } } } grouping tunnel-decap { description "Tunnel decapsulation inforamtion."; choice tunnel-type { description"Tunnel options for next-hops.";"Nexthop tunnel type options."; case ipv4 { if-feature ipv4-tunnel; container ipv4-decap { description "IPv4 decap."; leaf ipv4-decap { typeboolean;tunnel-decap-action-def; mandatory true; description "IPv4 decap operations."; } leaf ttl-action { type ttl-action-def; description "The ttl actions: no-action or copy to inner header."; }description "IPv4 decap.";} } case ipv6 { if-feature ipv6-tunnel; container ipv6-decap { description "IPv6 decap."; leaf ipv6-decap { typeboolean;tunnel-decap-action-def; mandatory true; description "IPv6 decap operations."; } leaf hop-limit-action { type hop-limit-action-def; description "The hop limit actions: no-action or copy to inner header."; }description "IPv6 decap.";} } case mpls { if-feature mpls-tunnel; containermpls-poplabel-pop { description "MPLS decap."; leafmpls-poplabel-pop { typeboolean;mpls-label-action-def; mandatory true; description "Pop aMPLSlabel from the label stack."; } leaf ttl-action { type ttl-action-def; description "The label ttl actions: no-action or copy to inner label"; }description "MPLS decap."; }} } } } grouping route-attributes { description "Route attributes."; leaf route-preference { typeuint32 ;uint32; mandatory true; description "ROUTE_PREFERENCE: This is a numerical value that allows for comparing routes from different protocols. Static configuration is also considered a protocol for the purpose of this field. It iss also known as administrative-distance. The lower the value, the higher the preference."; } leaf local-only { type boolean ; mandatory true; description "Indicate whether the attributes is local only."; } container address-family-route-attributes{ description "Address family related route attributes."; choice route-type { description "Address family related route attributes."; case ip-route-attributes { } case mpls-route-attributes { } case ethernet-route-attributes { } } } } container routing-instance { description"Configuration of an 'i2rs' pseudo-protocol instance consists"A routing instance, in the context of the RIB information model, is alistcollection ofribs.";RIBs, interfaces, and routing parameters"; leaf name { type string; mandatory true; description"A"The name of the routinginstance is identified by its name, INSTANCE_name. Thisinstance.This MUST be unique across all routing instances in a given network device."; } list interface-list { key "name"; description "This represents the list of interfaces associated with this routing instance. The interface list helps constrain the boundaries of packet forwarding. Packets coming on these interfaces are directly associated with the given routing instance. The interface list contains a list of identifiers, with each identifier uniquely identifying an interface."; leaf name { type if:interface-ref; description "A reference to the name of aconfigurednetwork layer interface."; } } leaf router-id { type yang:dotted-quad; description "Router ID - 32-bit number in the form of a dotted quad."; } leaf lookup-limit { type uint8; description "A limit on how many levels of a lookup can be performed."; } list rib-list { key "name"; description"This is the"A list of RIBs that are associated withthis routing instance. Eachthe routinginstance can have multiple RIBs to represent routes of different types.";instance."; leaf name { type string; mandatory true; description "A reference to the name ofaeach rib."; } leaf rib-family { type rib-family-def; mandatory true; description "The address family ofthea rib."; } leafenable-ip-rpf-checkip-rpf-check { type boolean; description "Each RIB can be optionally associated with a ENABLE_IP_RPF_CHECK attribute that enables Reverse path forwarding (RPF) checks on all IP routes in that RIB. Reverse path forwarding (RPF) check is used to prevent spoofing and limit malicious traffic."; } list route-list { key "route-index"; description "A list of routes of a rib."; uses route; } } } /*RPC Operations*/ rpc rib-add { description "To add a rib to a instance"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of the rib that is to be added."; } leaf rib-family { type rib-family-def; mandatory true; description "The address family of the rib."; } leafenable-ip-rpf-checkip-rpf-check { type boolean; description "Each RIB can be optionally associated with a ENABLE_IP_RPF_CHECK attribute that enables Reverse path forwarding (RPF) checks on all IP routes in that RIB. Reverse path forwarding (RPF) check is used to prevent spoofing and limit malicious traffic."; } } output { leaf result { typeboolean ;boolean; mandatory true; description "Return the result of the rib-add operation.1true -meanssuccess;0false -means falied.";failed."; } } } rpc rib-delete { description "To delete a rib from a routinginstance, byinstance. After deleting the rib, all routes installed in the rib will be deleted as well."; input { leaf rib-name { type string; mandatory true; description "A reference to the name of the rib that is to be deleted."; } } output { leaf result { typeboolean ;boolean; mandatory true; description "Return the result of the rib-delete operation.1true -meanssuccess;0false -means falied.";failed."; } } } rpc route-add { description "To add a route or a list of route to a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } container routes { description "The routes to be added to the rib."; list route-list { key "route-index"; description"Use a"The listto include allof routes to be added."; uses route-prefix; container route-attributes { uses route-attributes; description "Route attributes."; } container route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; description "Route vendor attributes."; } container nexthop { uses nexthop; description "Nexthop."; } } } } output { leaf result { typeboolean ;boolean; mandatory true; description "Return the result of the route-add operation.1true -meanssuccess;0false -means falied.";failed."; } } } rpc route-delete { description "To delete a route or a list of route from a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } container routes { description "The routes to be added to the rib."; list route-list{ key "route-index"; description "The list of routes to be deleted."; uses route-prefix; } } } output { leaf result { type boolean ; mandatory true; description "Return the result of the route-delete operation.1true -meanssuccess;0false -means falied.";failed."; } } } rpc route-update { description "To update a route or a list of route of a rib. The inputs: 1. The match conditions, could be: a. route prefix, or b. route attribtes, or c. nexthop; 2. The update parameters to be used: a. new nexhop; b. new route attributes; Actions: 1. update the nexthop 2. update the route attributes The outputs:1true - success;0false - failed. "; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } choice match-conditions { description"When conditions matched, update"Match options."; case match-route-prefix { description "Update theroutes."; //Updateroutes thathave the matchedmatch routeprefixes case match-route-prefix {prefix(es) condition."; container input-routes { description "The matched routes to be updated."; list route-list { key "route-index"; description "The list of routes to be updated."; uses route-prefix; choice update-actions-prefix { description "Updateactions include:actions: 1. update the nexthop 2. update the route attributes 3. update the route-vendor-attributes. "; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } } } }//Updatecase match-route-attributes { description "Update the routes thathavematch thematchedroute attributescase match-route-attributes {condition."; container input-route-attributes { description "The route attributes are used for matching."; uses route-attributes; } choice update-actions-attributes { description "Updateactions include:actions: 1. update the nexthop 2. update the route attributes 3. updateroute-vendor-attributes. ";the route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } }//Updatecase match-route-vendor-attributes { if-feature route-vendor-attributes; description "Update the routes thathavematch thematchedvendor attributescase match-vendor-route-attributes {condition"; containerinput-vendor-route-attributesinput-route-vendor-attributes { description "The vendor route attributes are used for matching."; uses route-vendor-attributes; } choice update-actions-vendor-attributes { description "Updateactions include:actions: 1. update the nexthop 2. update the route attributes 3. updateroute-vendor-attributes. ";the route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { uses route-vendor-attributes; } } }//Updatecase match-nexthop { description "Update the routes thathavematch thematched nexthop case match-nexthop {nexthop."; container input-nexthop { description "The nexthop used for matching."; uses nexthop; } choice update-actions-nexthop { description "Updateactions include:actions: 1. update nexthop 2. update route attributes 3. updateroute-vendor-attributes. ";route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } } } } output { leaf result { type boolean ; mandatory true; description "Return the result of the route-update operation.1true -meanssuccess;0false -means falied.";failed."; } } } rpc nh-add { description "To add a nexthop to a rib. Inputs parameters: 1. rib name 2. nexthop; Actions: Add the nexthop to the rib Outputs: 1.Operation result:1true -meanssuccess0false -means faled;failed; 2. nexthop identifier."; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } uses nexthop; } output { leaf result { type boolean ; mandatory true; description "Return the result of the nh-add operation.1true -meanssuccess;0false -means falied.";failed."; } leaf nexthop-id { type uint32; mandatory true; description "A nexthop identifer that is allocated to the nexthop."; } } } rpc nh-delete { description "To delete a nexthop from a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; }choice nexthop-context-or-id { description "Delete a nexthop by inputing the nexthop itself or its nexthop id."; case nexthop-context {uses nexthop; }case nexthop-identifier { leaf nexthop-identifer { type uint32; mandatory true; description "A reference to the nexthop to be deleted."; } } } }output { leaf result { type boolean ; mandatory true; description "Return the result of the nh-delete operation.1true -meanssuccess;0false -means falied.";failed."; } } } /*Notifications*/ notification nexthop-resolution-status-change { description "Nexthop resolution status (resolved/unresolved) notification."; container nexthop{ description "The nexthop."; uses nexthop; } leaf nexthop-state { type nexthop-state-def; mandatory true; description "Nexthop resolution status (resolved/unresolved) notification."; } } notification route-change { description "Route change notification."; leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } leaf rib-family { type rib-family-def; mandatory true; description "A reference to address family of a rib."; } uses route-prefix; leaf route-installed-state { type route-installed-state-def; mandatory true; description "Indicates whether the route got installed in the FIB."; } leaf route-state { type route-state-def; mandatory true; description "Indicates whether a route is fully resolved and is a candidate for selection."; } leaf route-change-reason { type route-reason-def; mandatory true; description "Return the reason that causes the route change."; } } } //<CODE ENDS> 4. IANA Considerations This document requests to register a URI in the "IETF XML registry" [RFC3688]: -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-i2rs-rib Registrant Contact: The IESG.XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- This document requests to register a YANG module in the "YANG Module Names registry" [RFC6020]: -------------------------------------------------------------------- name: ietf-i2rs-rib namespace: urn:ietf:params:xml:ns:yang:ietf-i2rs-rib prefix: iir reference: RFC XXXX -------------------------------------------------------------------- 5. Security Considerations This document introduces no extra new security threat and SHOULD follow the security requirements as stated in [I-D.ietf-i2rs-architecture]. 6. Contributors The following individuals also contribute to this document. o Zekun He, Tencent Holdings Ltd o Sujian Lu, Tencent Holdings Ltd o Jeffery Zhang, Juniper Networks 7. References 7.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <http://www.rfc-editor.org/info/rfc2119>. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, <http://www.rfc-editor.org/info/rfc3688>. [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, <http://www.rfc-editor.org/info/rfc6020>. [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, <http://www.rfc-editor.org/info/rfc6991>. 7.2. Informative References [I-D.ietf-i2rs-architecture] Atlas, A., Halpern, J., Hares, S., Ward, D., and T. Nadeau, "An Architecture for the Interface to the Routing System", draft-ietf-i2rs-architecture-09 (work in progress), March 2015. [I-D.ietf-i2rs-rib-info-model] Bahadur, N., Kini, S., and J. Medved, "Routing Information Base Info Model",draft-ietf-i2rs-rib-info-model-07draft-ietf-i2rs-rib-info-model-08 (work in progress),SeptemberOctober 2015. [I-D.ietf-i2rs-usecase-reqs-summary] Hares, S. and M. Chen, "Summary of I2RS Use Case Requirements", draft-ietf-i2rs-usecase-reqs-summary-01 (work in progress), May 2015. Authors' Addresses Lixing Wang Individual Email: wang_little_star@sina.com Hariharan Ananthakrishnan Packet Design Email: hari@packetdesign.com Mach(Guoyi) Chen Huawei Email: mach.chen@huawei.com Amit Dass Ericsson Torshamnsgatan 48. Stockholm 16480 Sweden Email: amit.dass@ericsson.com Sriganesh Kini Ericsson Email: sriganesh.kini@ericsson.com Nitin Bahadur Bracket Computing Email: nitin_bahadur@yahoo.com