draft-ietf-teas-network-assigned-upstream-label-12.txt   rfc8359.txt 
TEAS Working Group X. Zhang, Ed. Internet Engineering Task Force (IETF) X. Zhang, Ed.
Internet-Draft Huawei Technologies Request for Comments: 8359 Huawei Technologies
Updates: 3471, 3473, 6205 (if approved) V. Beeram, Ed. Updates: 3471, 3473, 6205 V. Beeram, Ed.
Intended status: Standards Track Juniper Networks Category: Standards Track Juniper Networks
Expires: August 2, 2018 I. Bryskin ISSN: 2070-1721 I. Bryskin
Huawei Technologies Huawei Technologies
D. Ceccarelli D. Ceccarelli
Ericsson Ericsson
O. Gonzalez de Dios O. Gonzalez de Dios
Telefonica Telefonica
January 29, 2018 March 2018
Network Assigned Upstream-Label Network-Assigned Upstream Label
draft-ietf-teas-network-assigned-upstream-label-12
Abstract Abstract
This document discusses a Generalized Multi-Protocol Label Switching This document discusses a Generalized Multi-Protocol Label Switching
(GMPLS) Resource reSerVation Protocol with Traffic Engineering (RSVP- (GMPLS) Resource reSerVation Protocol with Traffic Engineering
TE) mechanism that enables the network to assign an upstream label (RSVP-TE) mechanism that enables the network to assign an upstream
for a bidirectional Label Switched Path (LSP). This is useful in label for a bidirectional Label Switched Path (LSP). This is useful
scenarios where a given node does not have sufficient information to in scenarios where a given node does not have sufficient information
assign the correct upstream label on its own and needs to rely on the to assign the correct upstream label on its own and needs to rely on
downstream node to pick an appropriate label. This document updates the downstream node to pick an appropriate label. This document
RFCs 3471, 3473 and 6205 as it defines processing for a special label updates RFCs 3471, 3473, and 6205 as it defines processing for a
value in the UPSTREAM_LABEL object. special label value in the UPSTREAM_LABEL object.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This is an Internet Standards Track document.
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 This document is a product of the Internet Engineering Task Force
and may be updated, replaced, or obsoleted by other documents at any (IETF). It represents the consensus of the IETF community. It has
time. It is inappropriate to use Internet-Drafts as reference received public review and has been approved for publication by the
material or to cite them other than as "work in progress." Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
This Internet-Draft will expire on August 2, 2018. Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8359.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Unassigned Upstream Label . . . . . . . . . . . . . . . . . . 3 2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
2.1. Procedures . . . . . . . . . . . . . . . . . . . . . . . 4 3. Unassigned Upstream Label . . . . . . . . . . . . . . . . . . 3
2.2. Backwards Compatibility . . . . . . . . . . . . . . . . . 5 3.1. Procedures . . . . . . . . . . . . . . . . . . . . . . . 4
3. Use-Case: Wavelength Setup for IP over Optical Networks . . . 5 3.2. Backwards Compatibility . . . . . . . . . . . . . . . . . 5
3.1. Initial Setup . . . . . . . . . . . . . . . . . . . . . . 5 4. Use-Case: Wavelength Setup for IP over Optical Networks . . . 5
3.2. Wavelength Change . . . . . . . . . . . . . . . . . . . . 7 4.1. Initial Setup . . . . . . . . . . . . . . . . . . . . . . 6
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 4.2. Wavelength Change . . . . . . . . . . . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . 8 7.2. Informative References . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 9 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction 1. Introduction
A functional description of the Generalized Multi-Protocol Label A functional description of the Generalized Multi-Protocol Label
Switching (GMPLS) signaling extensions for setting up a bidirectional Switching (GMPLS) signaling extensions for setting up a bidirectional
Label Switched Path (LSP) is provided in [RFC3471]. The GMPLS Label Switched Path (LSP) is provided in [RFC3471]. The GMPLS
Resource reSerVation Protocol with Traffic Engineering (RSVP-TE) Resource reSerVation Protocol with Traffic Engineering (RSVP-TE)
extensions for setting up a bidirectional LSP are specified in extensions for setting up a bidirectional LSP are specified in
[RFC3473]. The bidirectional LSP setup is indicated by the presence [RFC3473]. The bidirectional LSP setup is indicated by the presence
of an UPSTREAM_LABEL object in the Path message. As per the existing of an UPSTREAM_LABEL object in the Path message. As per the existing
setup procedure outlined for a bidirectional LSP, each upstream node setup procedure outlined for a bidirectional LSP, each upstream node
must allocate a valid upstream label on the outgoing interface before must allocate a valid upstream label on the outgoing interface before
sending the initial Path message downstream. However, there are sending the initial Path message downstream. However, there are
certain scenarios (see Section 3) where it is not desirable or certain scenarios (see Section 4) where it is not desirable or
possible for a given node to pick the upstream label on its own. possible for a given node to pick the upstream label on its own.
This document defines the protocol mechanism to be used in such This document defines the protocol mechanism to be used in such
scenarios. This mechanism enables a given node to offload the task scenarios. This mechanism enables a given node to offload the task
of assigning the upstream label for a given bidirectional LSP to of assigning the upstream label for a given bidirectional LSP to
nodes downstream in the network. It is meant to be used only for nodes downstream in the network. It is meant to be used only for
bidirectional LSPs that assign symmetric labels at each hop along the bidirectional LSPs that assign symmetric labels at each hop along the
path of the LSP. Bidirectional Lambda Switch Capable (LSC) LSPs use path of the LSP. Bidirectional Lambda Switch Capable (LSC) LSPs use
symmetric lambda labels (format specified in [RFC6205]) at each hop symmetric lambda labels (format specified in [RFC6205]) at each hop
along the path of the LSP. along the path of the LSP.
As per the bidirectional LSP setup procedures specified in [RFC3471] As per the bidirectional LSP setup procedures specified in [RFC3471]
skipping to change at page 3, line 24 skipping to change at page 3, line 21
symmetric lambda labels (format specified in [RFC6205]) at each hop symmetric lambda labels (format specified in [RFC6205]) at each hop
along the path of the LSP. along the path of the LSP.
As per the bidirectional LSP setup procedures specified in [RFC3471] As per the bidirectional LSP setup procedures specified in [RFC3471]
and [RFC3473], the UPSTREAM_LABEL object must indicate a label that and [RFC3473], the UPSTREAM_LABEL object must indicate a label that
is valid for forwarding. This document updates that by allowing the is valid for forwarding. This document updates that by allowing the
UPSTREAM_LABEL object to indicate a special label that isn't valid UPSTREAM_LABEL object to indicate a special label that isn't valid
for forwarding. As per the bidirectional LSC LSP setup procedures for forwarding. As per the bidirectional LSC LSP setup procedures
specified in [RFC6205], the LABEL_SET object and the UPSTREAM_LABEL specified in [RFC6205], the LABEL_SET object and the UPSTREAM_LABEL
object must contain the same label value. This document updates that object must contain the same label value. This document updates that
by allowing the UPSREAM_LABEL object to carry a special label value by allowing the UPSTREAM_LABEL object to carry a special label value
that is different from the one used in the LABEL_SET object. that is different from the one used in the LABEL_SET object.
2. Unassigned Upstream Label 2. Requirements Language
This document defines a special label value - "0xFFFFFFFF" (for a The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
4-octet label) - to indicate an Unassigned Upstream Label. Similar "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Unassigned Upstream Label
This document defines a special label value -- "0xFFFFFFFF" (for a
4-octet label) -- to indicate an Unassigned Upstream Label. Similar
"all-ones" patterns are expected to be used for labels of other "all-ones" patterns are expected to be used for labels of other
sizes. sizes.
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1| |1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1|
| ... | | ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
skipping to change at page 3, line 47 skipping to change at page 4, line 4
|1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1| |1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1|
| ... | | ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Unassigned UPSTREAM_LABEL - "all-ones" Pattern Figure 1: Unassigned UPSTREAM_LABEL - "all-ones" Pattern
The presence of this value in the UPSTREAM_LABEL object of a Path The presence of this value in the UPSTREAM_LABEL object of a Path
message indicates that the upstream node has not assigned an upstream message indicates that the upstream node has not assigned an upstream
label on its own and has requested the downstream node to provide a label on its own and has requested the downstream node to provide a
label that it can use in both the forward and reverse directions. label that it can use in both the forward and reverse directions.
The presence of this value in the UPSTREAM_LABEL object of a Path The presence of this value in the UPSTREAM_LABEL object of a Path
message MUST also be interpreted by the receiving node as a request message MUST also be interpreted by the receiving node as a request
to mandate symmetric labels for the LSP. to mandate symmetric labels for the LSP.
2.1. Procedures 3.1. Procedures
The scope of the procedures is limited to the exchange and processing The scope of the procedures is limited to the exchange and processing
of messages between an upstream node and its immediate downstream of messages between an upstream node and its immediate downstream
node. The Unassigned Upstream Label is used by an upstream node when node. The Unassigned Upstream Label is used by an upstream node when
it is not in a position to pick the upstream label on its own. In it is not in a position to pick the upstream label on its own. In
such a scenario, the upstream node sends a Path message downstream such a scenario, the upstream node sends a Path message downstream
with an Unassigned Upstream Label and requests the downstream node to with an Unassigned Upstream Label and requests the downstream node to
provide a symmetric label. If the upstream node desires to make the provide a symmetric label. If the upstream node desires to make the
downstream node aware of its limitations with respect to label downstream node aware of its limitations with respect to label
selection, it MUST specify a list of valid labels via the LABEL_SET selection, it MUST specify a list of valid labels via the LABEL_SET
skipping to change at page 4, line 27 skipping to change at page 4, line 31
In response, the downstream node picks an appropriate symmetric label In response, the downstream node picks an appropriate symmetric label
and sends it via the LABEL object in the Resv message. The upstream and sends it via the LABEL object in the Resv message. The upstream
node would then start using this symmetric label for both directions node would then start using this symmetric label for both directions
of the LSP. If the downstream node cannot pick the symmetric label, of the LSP. If the downstream node cannot pick the symmetric label,
it MUST issue a PathErr message with a "Routing Problem/Unacceptable it MUST issue a PathErr message with a "Routing Problem/Unacceptable
Label Value" indication. If the upstream node that signals an Label Value" indication. If the upstream node that signals an
Unassigned Upstream Label receives a label with the "all-ones" Unassigned Upstream Label receives a label with the "all-ones"
pattern or any other unacceptable label in the LABEL object of the pattern or any other unacceptable label in the LABEL object of the
Resv message, it MUST issue a ResvErr message with a "Routing Resv message, it MUST issue a ResvErr message with a "Routing
Problem/Unacceptable Label" indication. Problem/Unacceptable Label Value" indication.
The upstream node will continue to signal the Unassigned Upstream The upstream node will continue to signal the Unassigned Upstream
Label in the Path message even after it receives an appropriate Label in the Path message even after it receives an appropriate
symmetric label in the Resv message. This is done to make sure that symmetric label in the Resv message. This is done to make sure that
the downstream node would pick a different symmetric label if and the downstream node would pick a different symmetric label if and
when it needs to change the label at a later time. If the upstream when it needs to change the label at a later time. If the upstream
node receives an unacceptable changed label, then it MUST issue a node receives an unacceptable changed label, then it MUST issue a
ResvErr message with a "Routing Problem/Unacceptable Label" ResvErr message with a "Routing Problem/Unacceptable Label Value"
indication. indication.
+----------+ +------------+ +----------+ +------------+
---| Upstream |--------------------| Downstream |--- ---| Upstream |--------------------| Downstream |---
+----------+ +------------+ +----------+ +------------+
Path Path
Upstream Label (Unassigned) Upstream Label (Unassigned)
Label-Set (L1, L2 ... Ln) Label-Set (L1, L2 ... Ln)
-------------------> ------------------->
Resv Resv
Label (Assigned - L2) Label (Assigned - L2)
<------------------- <-------------------
Figure 2: Signaling Sequence Figure 2: Signaling Sequence
2.2. Backwards Compatibility 3.2. Backwards Compatibility
If the downstream node is running an implementation that doesn't If the downstream node is running an implementation that doesn't
support the semantics of an Unassigned UPSTREAM LABEL, it will either support the semantics of an Unassigned UPSTREAM LABEL, it will either
(a) reject the special label value and generate an error as specified (a) reject the special label value and generate an error as specified
in Section 3.1 of [RFC3473] or (b) accept it and treat it as a valid in Section 3.1 of [RFC3473] or (b) accept it and treat it as a valid
label. label.
If the behavior that is exhibited is (a), then there are no backwards If the behavior that is exhibited is (a), then there are no backwards
compatibility concerns. If the behavior that is exhibited is (b), compatibility concerns. If the behavior that is exhibited is (b),
then the downstream node will send a label with the "all-ones" then the downstream node will send a label with the "all-ones"
pattern in the LABEL object of the Resv message. In response, the pattern in the LABEL object of the Resv message. In response, the
upstream node will issue a ResvErr message with a "Routing Problem/ upstream node will issue a ResvErr message with a "Routing Problem/
Unassigned Label" indication. Unacceptable Label Value" indication.
3. Use-Case: Wavelength Setup for IP over Optical Networks 4. Use-Case: Wavelength Setup for IP over Optical Networks
Consider the network topology depicted in Figure 3. Nodes A and B Consider the network topology depicted in Figure 3. Nodes A and B
are client IP routers that are connected to an optical Wavelength are client IP routers that are connected to an optical Wavelength
Division Multiplexing (WDM) transport network. F and I represent WDM Division Multiplexing (WDM) transport network. F and I represent WDM
nodes. The transponder sits on the router and is directly connected nodes. The transponder sits on the router and is directly connected
to the add-drop port on a WDM node. to the add-drop port on a WDM node.
The optical signal originating on "Router A" is tuned to a particular The optical signal originating on "Router A" is tuned to a particular
wavelength. On "WDM-Node F", it gets multiplexed with optical wavelength. On "WDM-Node F", it gets multiplexed with optical
signals at other wavelengths. Depending on the implementation of signals at other wavelengths. Depending on the implementation of
skipping to change at page 5, line 43 skipping to change at page 6, line 9
appropriate wavelength. In other words, having the router send appropriate wavelength. In other words, having the router send
signals with a wrong wavelength may adversely impact existing optical signals with a wrong wavelength may adversely impact existing optical
trails. If the clients do not have full visibility into the optical trails. If the clients do not have full visibility into the optical
network, they are not in a position to pick the correct wavelength in network, they are not in a position to pick the correct wavelength in
advance. advance.
The rest of this section examines how the protocol mechanism proposed The rest of this section examines how the protocol mechanism proposed
in this document allows the optical network to select and communicate in this document allows the optical network to select and communicate
the correct wavelength to its clients. the correct wavelength to its clients.
3.1. Initial Setup 4.1. Initial Setup
+---+ /-\ /-\ +---+ +---+ /-\ /-\ +---+
| A |----------------( F ) ~~~~~~~~~ ( I )----------------| B | | A |----------------( F ) ~~~~~~~~~ ( I )----------------| B |
+---+ \-/ \-/ +---+ +---+ \-/ \-/ +---+
Path Path
Upstream Label (Unassigned/0xFFFFFFFF) Upstream Label (Unassigned/0xFFFFFFFF)
---------------------> --------------------->
-- ~~ -- ~~ --> -- ~~ -- ~~ -->
Path Path
--------------------> -------------------->
skipping to change at page 6, line 32 skipping to change at page 6, line 39
Steps: Steps:
o "Router A" does not have enough information to pick an appropriate o "Router A" does not have enough information to pick an appropriate
client wavelength. It sends a Path message downstream requesting client wavelength. It sends a Path message downstream requesting
the network to assign an appropriate symmetric label for its use. the network to assign an appropriate symmetric label for its use.
Since the client wavelength is unknown, the laser is off at the Since the client wavelength is unknown, the laser is off at the
ingress client. ingress client.
o The downstream node (Node F) receives the Path message, chooses o The downstream node (Node F) receives the Path message, chooses
the appropriate wavelength values and forwards them in appropriate the appropriate wavelength values, and forwards them in
label fields to the egress client ("Router B"). appropriate label fields to the egress client ("Router B").
o "Router B" receives the Path message, turns the laser ON and tunes o "Router B" receives the Path message, turns the laser ON and tunes
it to the appropriate wavelength (received in the UPSTREAM_LABEL/ it to the appropriate wavelength (received in the UPSTREAM_LABEL/
LABEL_SET of the Path) and sends a Resv message upstream. LABEL_SET of the Path) and sends a Resv message upstream.
o The Resv message received by the ingress client carries a valid o The Resv message received by the ingress client carries a valid
symmetric label in the LABEL object. "Router A" turns on the symmetric label in the LABEL object. "Router A" turns on the
laser and tunes it to the wavelength specified in the network laser and tunes it to the wavelength specified in the network
assigned symmetric LABEL. assigned symmetric LABEL.
For cases where the egress-node relies on RSVP signaling to determine For cases where the egress-node relies on RSVP signaling to determine
exactly when to start using the LSP, implementations may choose to exactly when to start using the LSP, implementations may choose to
integrate the above sequence with any of the existing graceful setup integrate the above sequence with any of the existing graceful setup
procedures: procedures:
o "ResvConf" setup procedure ([RFC2205]) o "ResvConf" setup procedure ([RFC2205])
o 2-step "ADMIN STATUS" based setup procedure ("A" bit set in the
first step; "A" bit cleared when the LSP is ready for use). o Two-step "ADMIN STATUS" based setup procedure ("A" bit set in the
first step; "A" bit cleared when the LSP is ready for use)
([RFC3473]) ([RFC3473])
3.2. Wavelength Change 4.2. Wavelength Change
After the LSP is set up, the network may decide to change the After the LSP is set up, the network may decide to change the
wavelength for the given LSP. This could be for a variety of reasons wavelength for the given LSP. This could be for a variety of reasons
including policy reasons, restoration within the core, preemption, including policy reasons, restoration within the core, preemption,
etc. etc.
In such a scenario, if the ingress client receives a changed label In such a scenario, if the ingress client receives a changed label
via the LABEL object in a modified Resv message, it retunes the laser via the LABEL object in a modified Resv message, it retunes the laser
at the ingress to the new wavelength. Similarly, if the egress at the ingress to the new wavelength. Similarly, if the egress
client receives a changed label via UPSTREAM_LABEL/LABEL_SET in a client receives a changed label via UPSTREAM_LABEL/LABEL_SET in a
modified Path message, it retunes the laser at the egress to the new modified Path message, it retunes the laser at the egress to the new
wavelength. wavelength.
4. IANA Considerations 5. IANA Considerations
IANA maintains the "Generalized Multi-Protocol Label Switching IANA maintains the "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Parameters" registry. IANA is requested to add a (GMPLS) Signaling Parameters" registry. IANA has added a new
new subregistry for "Special Purpose Generalized Label Values". New subregistry titled "Special Purpose Generalized Label Values". New
values are assigned according to Standards Action. values are assigned according to Standards Action [RFC8126].
Special Purpose Generalized Label Values Special Purpose Generalized Label Values
Pattern/ Label Name Applicable Reference Pattern/ Label Name Applicable Reference
Value Objects Value Objects
-------- ---------------- -------------- ---------- -------- ---------------- -------------- ----------
all-ones Unassigned UPSTREAM_LABEL [This.I-D] all-ones Unassigned UPSTREAM_LABEL [RFC8359]
Upstream Label Upstream Label
5. Security Considerations 6. Security Considerations
This document defines a special label value to be carried in the This document defines a special label value to be carried in the
UPSTREAM_LABEL object of a Path message. This special label value is UPSTREAM_LABEL object of a Path message. This special label value is
used to enable the function of requesting network assignment of an used to enable the function of requesting network assignment of an
upstream label. The changes proposed in this document pertain to the upstream label. The changes proposed in this document pertain to the
semantics of a specific field in an existing RSVP object and the semantics of a specific field in an existing RSVP object and the
corresponding procedures. Thus, there are no new security corresponding procedures. Thus, there are no new security
implications raised by this document and the security considerations implications raised by this document and the security considerations
discussed by [RFC3473] still apply. discussed by [RFC3473] still apply.
For a general discussion on MPLS and GMPLS related security issues, For a general discussion on MPLS and GMPLS related security issues,
see the MPLS/GMPLS security framework [RFC5920]. see the MPLS/GMPLS security framework [RFC5920].
6. Acknowledgements 7. References
The authors would like to thank Adrian Farrel and Chris Bowers for
their inputs.
7. Contributors
John Drake
Juniper Networks
Email: jdrake@juniper.net
Gert Grammel
Juniper Networks
Email: ggrammel@juniper.net
Pawel Brzozowski
ADVA Optical Networking
Email: pbrzozowski@advaoptical.com
Zafar Ali
Cisco Systems, Inc.
Email: zali@cisco.com
8. References
8.1. Normative References 7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, <https://www.rfc- DOI 10.17487/RFC2119, March 1997,
editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC2205] Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S. [RFC2205] Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S.
Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1 Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1
Functional Specification", RFC 2205, DOI 10.17487/RFC2205, Functional Specification", RFC 2205, DOI 10.17487/RFC2205,
September 1997, <https://www.rfc-editor.org/info/rfc2205>. September 1997, <https://www.rfc-editor.org/info/rfc2205>.
[RFC3471] Berger, L., Ed., "Generalized Multi-Protocol Label [RFC3471] Berger, L., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Functional Description", Switching (GMPLS) Signaling Functional Description",
RFC 3471, DOI 10.17487/RFC3471, January 2003, RFC 3471, DOI 10.17487/RFC3471, January 2003,
<https://www.rfc-editor.org/info/rfc3471>. <https://www.rfc-editor.org/info/rfc3471>.
[RFC3473] Berger, L., Ed., "Generalized Multi-Protocol Label [RFC3473] Berger, L., Ed., "Generalized Multi-Protocol Label
Switching (GMPLS) Signaling Resource ReserVation Protocol- Switching (GMPLS) Signaling Resource ReserVation Protocol-
Traffic Engineering (RSVP-TE) Extensions", RFC 3473, Traffic Engineering (RSVP-TE) Extensions", RFC 3473,
DOI 10.17487/RFC3473, January 2003, <https://www.rfc- DOI 10.17487/RFC3473, January 2003,
editor.org/info/rfc3473>. <https://www.rfc-editor.org/info/rfc3473>.
[RFC6205] Otani, T., Ed. and D. Li, Ed., "Generalized Labels for [RFC6205] Otani, T., Ed. and D. Li, Ed., "Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers", Lambda-Switch-Capable (LSC) Label Switching Routers",
RFC 6205, DOI 10.17487/RFC6205, March 2011, RFC 6205, DOI 10.17487/RFC6205, March 2011,
<https://www.rfc-editor.org/info/rfc6205>. <https://www.rfc-editor.org/info/rfc6205>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
8.2. Informative References 7.2. Informative References
[RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS [RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS
Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010, Networks", RFC 5920, DOI 10.17487/RFC5920, July 2010,
<https://www.rfc-editor.org/info/rfc5920>. <https://www.rfc-editor.org/info/rfc5920>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>.
Acknowledgements
The authors would like to thank Adrian Farrel and Chris Bowers for
their inputs.
Contributors
John Drake
Juniper Networks
Email: jdrake@juniper.net
Gert Grammel
Juniper Networks
Email: ggrammel@juniper.net
Pawel Brzozowski
ADVA Optical Networking
Email: pbrzozowski@advaoptical.com
Zafar Ali
Cisco Systems, Inc.
Email: zali@cisco.com
Authors' Addresses Authors' Addresses
Xian Zhang (editor) Xian Zhang (editor)
Huawei Technologies Huawei Technologies
Email: zhang.xian@huawei.com Email: zhang.xian@huawei.com
Vishnu Pavan Beeram (editor) Vishnu Pavan Beeram (editor)
Juniper Networks Juniper Networks
 End of changes. 35 change blocks. 
104 lines changed or deleted 110 lines changed or added

This html diff was produced by rfcdiff 1.46. The latest version is available from http://tools.ietf.org/tools/rfcdiff/