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Networking Working Group                                   Yongqing. Zhu
Internet-Draft                                             China Telecom
Intended status: Standards Track                               Ran. Chen
Expires: June 3, 2020                                       Shaofu. Peng
                                                         ZTE Corporation
                                                            Fengwei. Qin
                                                            China Mobile
                                                       December 01, 2019


IS-IS Extensions to Support Packet Network Slicing using Segment Routing
                 draft-zch-lsr-isis-network-slicing-03

Abstract

   [I-D.peng-teas-network-slicing] defines a unified TN-slice
   identifier, AII(administrative instance identifier), to indicate the
   topology, computing, storage resources of the dedicated virtual
   network for both intra-domain and inter-domain network slicing
   scenarios.  This draft describes the IS-IS extensions required to
   support Packet Network Slicing using Segment Routing.

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 https://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 on June 3, 2020.

Copyright Notice

   Copyright (c) 2019 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents



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   carefully, as they describe your rights and restrictions with respect
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   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
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Router Capabilities for TN-slice Identifier . . . . . . . . .   3
   4.  Advertising TN-slice Identifier as a new TE parameter of a
       link  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Advertising TN-slice Identifier for L2 Bundle Member  . . . .   5
   6.  Advertising prefix-SID per TN-slice Identifier  . . . . . . .   5
   7.  Advertising Adjacency-SID per TN-slice Identifier . . . . . .   7
   8.  Advertising Adjacency-SID per TN-slice Identifier in LANs . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Router Capabilities for TN-slice Identifier . . . . . . .  10
     9.2.  TN-slice Identifier list sub-TLV  . . . . . . . . . . . .  10
     9.3.  L2 Bundle Member TN-Slice Identifier sub-TLV  . . . . . .  10
     9.4.  Prefix-SID for TN-slice Identifier sub-TLV  . . . . . . .  10
     9.5.  Adjacency-SID for TN-slice Identifier sub-TLV . . . . . .  10
     9.6.  LAN-Adj-SID for TN-slice Identifier sub-TLV . . . . . . .  11
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     12.1.  Normative references . . . . . . . . . . . . . . . . . .  11
     12.2.  Informative references . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   For a packet network, network slicing requires the underlying network
   to support partitioning of the network resources to provide the
   client with dedicated (private) networking, computing, and storage
   resources drawn from a shared pool.  [I-D.peng-teas-network-slicing]
   defines a unified TN-slice identifier, AII(administrative instance
   identifier), to indicate the topology, computing, storage resources
   of the dedicated virtual network for both intra-domain and inter-
   domain network slicing scenarios, and how to compute SR-BE or SR-TE
   path according to TN-slice Identifier combined with other creteria.

   This draft describes the IS-IS extensions required to distribute TN-
   slice Identifier(that is AII) information in an AS.






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2.  Conventions used in this document

   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 RFC2119.

3.  Router Capabilities for TN-slice Identifier

   Although a router can deduce which TN-slices it has participated in
   according to the AII configuration of all links, an ISIS instance can
   explicitly control which TN-slices it wants to enable (or join), to
   explicitly control which SPT (shortest path tree) for a specific AII
   to be created.  It is possible for a route process not to join any
   TN-slices (except the default AII 0) in despite of any AII
   configuration of any links.  Especially, it is hard to deduce the
   participated TN-slice according to the AII configuration of L2 Bundle
   Member.

   This section defines AII Participation sub-TLV which is inserted into
   the IS-IS Router Capability TLV-242 that is defined in [RFC7981], to
   explicitly advertise which TN-slice a router wants to take part in.

   The TN-slice identifier Participation sub-TLV has the following
   format:


        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type=TBD1    |   Length      |    Number     |               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     AII for virtual networks 1                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                       ......                                  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      AII for virtual networks N               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                                 Figure 1

   where:

   Type: TBD1 (Suggested value to be assigned by IANA)

   Length: variable.

   Number:Number of virtual networks.



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   AII for VN: allocate different TN-slice identifier (AII) for
   different virtual networks.  AII is used to distinguish different
   virtual network resources.

4.  Advertising TN-slice Identifier as a new TE parameter of a link

   [RFC5305] describes extensions to the Intermediate System to
   Intermediate System (IS-IS) protocol to support Traffic Engineering
   (TE).

   TN-slice Identifier can be used to color links to partition underlay
   resource.  This document defines a new extension of the existing IGP-
   TE mechanisms[RFC5305] to distribute TN-slice Identifier information
   in an AS as a new TE parameter of a link.

   The TN-slice Identifier list sub-TLV has the following format:


         0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |  Type=TBD2    |   Length      |    Reserved   |    Number     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     AII for virtual networks 1                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |                       ......                                  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      AII for virtual networks N               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 2

   Type: TBD2 (Suggested value to be assigned by IANA)

   Length: variable.

   Number:Number of virtual networks.

   AII for VN: allocate different TN-slice identifier (AII) for
   different virtual networks.  AII is used to distinguish different
   virtual network resources.

   This sub-TLV MAY be present in any of the following TLVs:

   TLV-22 (Extended IS reachability) [RFC5305].

   TLV-222 (Multitopology IS)[RFC5120].




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   TLV-23 (IS Neighbor Attribute)[RFC5311].

   TLV-223 (Multitopology IS Neighbor Attribute)[RFC5311].

   TLV-141 (inter-AS reachability information)[RFC5316].

   This sub-TLV SHOULD appear once at most in each TLV.  Indicates that
   a link MAY belong to multiple virtual networks.

   Note that AII 0 does not require notification, and all links are
   always in AII 0 at the same time.

5.  Advertising TN-slice Identifier for L2 Bundle Member

   [I-D.ietf-isis-l2bundles] defines a sub-TLV of L2 Bundle Attribute
   Descriptors, and the sub-TLV may define an attribute common to all of
   the bundle members listed or a sub-TLV may define an attribute unique
   to each bundle member.  This document defines a new sub-TLV: L2
   Bundle Member TN-Slice Identifier sub-TLV.

   This sub-TLV is used to advertise TN-slice Identifier for L2 Bundle
   Member associated with a parent L3 adjacency which is Point-to-
   Point.The following format is defined for this sub-TLV:

   Type: TBD3.

   Length: variable

   L2 Bundle Member TN-slice Identifier.There MUST be one TN-slice
   Identifier(AII) for each of the L2 Bundle Members advertised under
   the preceding L2 Bundle Member Attribute Descriptor.

   This sub-TLV MAY be present in the following TLVs:

   TLV-25 (L2 Bundle Member Attributes) [I-D.ietf-isis-l2bundles].

   This sub-TLV SHOULD appear once at most in the TLV.  Indicates that
   the TN-slice Identifier for L2 Bundle Member.

6.  Advertising prefix-SID per TN-slice Identifier

   [I-D.ietf-isis-segment-routing-extensions] defines a new IS-IS sub-
   TLV: the Prefix Segment Identifier sub-TLV (Prefix-SID sub-TLV).  The
   Prefix-SID sub-TLV carries the Segment Routing IGP-Prefix-SID as
   defined in [RFC8402], and is associated to a prefix advertised by a
   node.





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   To distinguish forwarding behavior of different virtual networks,
   Prefix-SID need to be allocated per TN-slice Identifier and
   advertised in the IGP domain.  This document defines a new extension
   of the existing Prefix-SID sub-TLV.

   The Prefix-SID for TN-slice Identifier sub-TLV has the following
   format:


         0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type=TBD4   |    Length     |     Flag      |   Algorithm   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                            AII                                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      SID/Index/Label(Variable)                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 3

   where:

   Type:TBD4 (Suggested value to be assigned by IANA)

   Length: Variable.  Depending on the size of the SID.

   The "Flags" and "SID/Index/Label" fields are the same as the Prefix-
   SID sub-TLV [I-D.ietf-isis-segment-routing-extensions].

   Algorithm: Accoridng to section "3.2.  SR-Algorithm Sub-TLV" of
   >[I-D.ietf-isis-segment-routing-extensions], two values can be set in
   this field.

   o  0: Shortest Path First (SPF) algorithm based on link metric.

   o  1: Strict Shortest Path First (SPF) algorithm based on link
      metric.

   Note that[I-D.ietf-lsr-flex-algo].also allows user to define other
   algorithm values, i.e., FA-id within [128, 255], for the purpose of
   constraint based path computation.  However, an FA-id algorithm value
   MUST not be set in this field, the reason is that FA-id has not
   semantic local within AII.

   AII: Identifies the TN-slice (AII) information corresponding to the
   Prefix-SID.




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   This sub-TLV MAY be present in any of the following TLVs:

   TLV-135 (Extended IPv4 reachability) defined in [RFC5305].

   TLV-235 (Multitopology IPv4 Reachability) defined in [RFC5120].

   TLV-236 (IPv6 IP Reachability) defined in [RFC5308].

   TLV-237 (Multitopology IPv6 IP Reachability) defined in [RFC5120].

   This sub-TLV MAY appear multiple times in each TLV.

7.  Advertising Adjacency-SID per TN-slice Identifier

   [I-D.ietf-isis-segment-routing-extensions]defines the IS-IS sub-TLV:
   the Adjacency Segment Identifier sub-TLV (Adj-SID sub-TLV).The Adj-
   SID sub-TLV is an optional sub-TLV carrying the Segment Routing IGP-
   Adjacency-SID as defined in [RFC8402].

   To distinguish forwarding behavior of different virtual networks,
   Adjacency-SID need to be allocated per TN-slice Identifier and
   advertised in the IGP domain.  This document defines a new extension
   of the existing Adjacency-SID sub-TLV.

   The Adjacency-SID for TN-slice Identifier sub-TLV has the following
   format:


         0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type=TBD5   |    Length     |     Flag      |   Algorithm   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                            AII                                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      SID/Index/Label(Variable)                |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 4

   where:

   Type:TBD5(Suggested value to be assigned by IANA)

   Length: Variable.  Depending on the size of the SID.

   The "Flags" and "SID/Index/Label" fields are the same as the
   Adjacency-SID sub-TLV [I-D.ietf-isis-segment-routing-extensions].



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   AII: Identifies the TN-slice (AII) information corresponding to the
   Adjacency-SID.

   This sub-TLV MAY be present in any of the following TLVs:

   TLV-22 (Extended IS reachability) [RFC5305].

   TLV-222 (Multitopology IS)[RFC5120].

   TLV-23 (IS Neighbor Attribute)[RFC5311].

   TLV-223 (Multitopology IS Neighbor Attribute)[RFC5311].

   TLV-141 (inter-AS reachability information)[RFC5316].

   Multiple Adj-SID sub-TLVs MAY be associated with a single IS-
   neighbor.  This sub-TLV MAY appear multiple times in each TLV.

8.  Advertising Adjacency-SID per TN-slice Identifier in LANs

   In LAN subnetworks,[I-D.ietf-isis-segment-routing-extensions]defines
   the LAN-Adj-SID sub-TLV for a router to advertise the Adj-SID of each
   of its neighbors.

   To distinguish forwarding behavior of different virtual networks,
   Adjacency-SID need to be allocated per TN-slice Identifier and
   advertised in the IGP domain.  This document defines a new extension
   of the existing Adjacency-SID sub-TLV.

   The LAN-Adj-SID for TN-slice Identifier sub-TLV has the following
   format:




















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           0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Type=TBD6   |     Length    |      Flags    |    Weight     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                  Neighbor System-ID (ID length octets)        |
     +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              AII                              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   SID/Label/Index (variable)                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                                 Figure 5

   where:

   Type:TBD6 (Suggested value to be assigned by IANA)

   Length: Variable.  Depending on the size of the SID.

   The "Flags" and "SID/Index/Label" fields are the same as the
   Adjacency-SID sub-TLV [I-D.ietf-isis-segment-routing-extensions].

   AII: Identifies the TN-slice (AII) information corresponding to the
   Adjacency-SID.

   This sub-TLV MAY be present in any of the following TLVs:

   TLV-22 (Extended IS reachability) [RFC5305].

   TLV-222 (Multitopology IS)[RFC5120].

   TLV-23 (IS Neighbor Attribute)[RFC5311].

   TLV-223 (Multitopology IS Neighbor Attribute)[RFC5311].

   Multiple Adj-SID sub-TLVs MAY be associated with a single IS-
   neighbor.  This sub-TLV MAY appear multiple times in each TLV.








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9.  IANA Considerations

   This document requests allocation for the following Sub-TLVs.

9.1.  Router Capabilities for TN-slice Identifier

   This document requests IANA to assign a new code point in the "sub-
   TLV for TLV 242" registry.

   Type: TBD1

9.2.  TN-slice Identifier list sub-TLV

   This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
   222, 23,223 and 141 registry".

   Type:TBD2(to be assigned by IANA).

9.3.  L2 Bundle Member TN-Slice Identifier sub-TLV

   This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
   222, 23, 25, 223 and 141 registry.

   Type:TBD3(to be assigned by IANA).

   This sub-TLV is allowed in the following TLVs:

          22 23 25 141 222 223
          n  n  y  n   n   n

9.4.  Prefix-SID for TN-slice Identifier sub-TLV

   This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs
   135,235,226 and 237 registry".

   Type:TBD4(to be assigned by IANA).

9.5.  Adjacency-SID for TN-slice Identifier sub-TLV

   This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
   222, 23,223 and 141 registry".

   Type:TBD5(to be assigned by IANA).








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9.6.  LAN-Adj-SID for TN-slice Identifier sub-TLV

   This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
   222, 23, and 223registry".

   Type:TBD6(to be assigned by IANA).

10.  Security Considerations

   TBD.

11.  Acknowledgements

   TBD.

12.  References

12.1.  Normative references

   [I-D.ietf-isis-l2bundles]
              Ginsberg, L., Bashandy, A., Filsfils, C., Nanduri, M., and
              E. Aries, "Advertising L2 Bundle Member Link Attributes in
              IS-IS", draft-ietf-isis-l2bundles-07 (work in progress),
              May 2017.

   [I-D.ietf-isis-segment-routing-extensions]
              Previdi, S., Ginsberg, L., Filsfils, C., Bashandy, A.,
              Gredler, H., and B. Decraene, "IS-IS Extensions for
              Segment Routing", draft-ietf-isis-segment-routing-
              extensions-25 (work in progress), May 2019.

   [I-D.ietf-lsr-flex-algo]
              Psenak, P., Hegde, S., Filsfils, C., Talaulikar, K., and
              A. Gulko, "IGP Flexible Algorithm", draft-ietf-lsr-flex-
              algo-05 (work in progress), November 2019.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC5120]  Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi
              Topology (MT) Routing in Intermediate System to
              Intermediate Systems (IS-ISs)", RFC 5120,
              DOI 10.17487/RFC5120, February 2008,
              <https://www.rfc-editor.org/info/rfc5120>.





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   [RFC5305]  Li, T. and H. Smit, "IS-IS Extensions for Traffic
              Engineering", RFC 5305, DOI 10.17487/RFC5305, October
              2008, <https://www.rfc-editor.org/info/rfc5305>.

   [RFC5308]  Hopps, C., "Routing IPv6 with IS-IS", RFC 5308,
              DOI 10.17487/RFC5308, October 2008,
              <https://www.rfc-editor.org/info/rfc5308>.

   [RFC5311]  McPherson, D., Ed., Ginsberg, L., Previdi, S., and M.
              Shand, "Simplified Extension of Link State PDU (LSP) Space
              for IS-IS", RFC 5311, DOI 10.17487/RFC5311, February 2009,
              <https://www.rfc-editor.org/info/rfc5311>.

   [RFC5316]  Chen, M., Zhang, R., and X. Duan, "ISIS Extensions in
              Support of Inter-Autonomous System (AS) MPLS and GMPLS
              Traffic Engineering", RFC 5316, DOI 10.17487/RFC5316,
              December 2008, <https://www.rfc-editor.org/info/rfc5316>.

   [RFC7981]  Ginsberg, L., Previdi, S., and M. Chen, "IS-IS Extensions
              for Advertising Router Information", RFC 7981,
              DOI 10.17487/RFC7981, October 2016,
              <https://www.rfc-editor.org/info/rfc7981>.

   [RFC8402]  Filsfils, C., Ed., Previdi, S., Ed., Ginsberg, L.,
              Decraene, B., Litkowski, S., and R. Shakir, "Segment
              Routing Architecture", RFC 8402, DOI 10.17487/RFC8402,
              July 2018, <https://www.rfc-editor.org/info/rfc8402>.

12.2.  Informative references

   [I-D.peng-teas-network-slicing]
              Peng, S., Chen, R., Mirsky, G., and F. Qin, "Packet
              Network Slicing using Segment Routing", draft-peng-teas-
              network-slicing-01 (work in progress), November 2019.

Authors' Addresses

   Yongqing Zhu
   China Telecom

   Email: zhuyq.gd@chinatelecom.cn


   Ran Chen
   ZTE Corporation

   Email: chen.ran@zte.com.cn




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   Shaofu Peng
   ZTE Corporation

   Email: peng.shaofu@zte.com.cn


   Fengwei Qin
   China Mobile

   Email: qinfengwei@chinamobile.com









































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