draft-ietf-idr-bgp-prefix-sid-23.txt   draft-ietf-idr-bgp-prefix-sid-24.txt 
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Internet-Draft C. Filsfils Internet-Draft C. Filsfils
Intended status: Standards Track A. Lindem, Ed. Intended status: Standards Track A. Lindem, Ed.
Expires: December 16, 2018 Cisco Systems Expires: December 16, 2018 Cisco Systems
A. Sreekantiah A. Sreekantiah
H. Gredler H. Gredler
RtBrick Inc. RtBrick Inc.
June 14, 2018 June 14, 2018
Segment Routing Prefix SID extensions for BGP Segment Routing Prefix SID extensions for BGP
draft-ietf-idr-bgp-prefix-sid-23 draft-ietf-idr-bgp-prefix-sid-24
Abstract Abstract
The Segment Routing (SR) architecture allows a node to steer a packet The Segment Routing (SR) architecture allows a node to steer a packet
flow through any topological path and service chain by leveraging flow through any topological path and service chain by leveraging
source routing. The ingress node prepends an SR header to a packet source routing. The ingress node prepends an SR header to a packet
containing a set of segment identifiers (SID). Each SID represents a containing a set of segment identifiers (SID). Each SID represents a
topological or a service-based instruction. Per-flow state is topological or a service-based instruction. Per-flow state is
maintained only on the ingress node of the SR domain. An SR domain maintained only on the ingress node of the SR domain. An SR domain
is defined as a single administrative domain for global SID is defined as a single administrative domain for global SID
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40 BGP Prefix-SID (TEMPORARY - registered 2015-09-30, expires 40 BGP Prefix-SID (TEMPORARY - registered 2015-09-30, expires
2016-09-30) [draft-ietf-idr-bgp-prefix-sid] 2016-09-30) [draft-ietf-idr-bgp-prefix-sid]
This document defines 3 TLVs for the BGP Prefix-SID attribute. These This document defines 3 TLVs for the BGP Prefix-SID attribute. These
TLVs need to be registered with IANA. We request IANA to create a TLVs need to be registered with IANA. We request IANA to create a
registry for BGP Prefix-SID Attribute TLVs as follows: registry for BGP Prefix-SID Attribute TLVs as follows:
Under "Border Gateway Protocol (BGP) Parameters" registry, "BGP Under "Border Gateway Protocol (BGP) Parameters" registry, "BGP
Prefix-SID TLV Types" Reference: draft-ietf-idr-bgp-prefix-sid Prefix-SID TLV Types" Reference: draft-ietf-idr-bgp-prefix-sid
Registration Procedure(s): Values 1-254 First Come First Served Registration Procedure(s): Values 1-254 - Expert Review as defined in
(FCFS), Value 0 and 255 reserved [RFC8126], Value 0 and 255 reserved
Value Type Reference Value Type Reference
0 Reserved this document 0 Reserved this document
1 Label-Index this document 1 Label-Index this document
2 Deprecated this document 2 Deprecated this document
3 Originator SRGB this document 3 Originator SRGB this document
4-254 Unassigned 4-254 Unassigned
255 Reserved this document 255 Reserved this document
This document also requests creation of the "BGP Prefix-SID Label- This document also requests creation of the "BGP Prefix-SID Label-
Index TLV Flags" registry under the "Border Gateway Protocol (BGP) Index TLV Flags" registry under the "Border Gateway Protocol (BGP)
Parameters" registry, Reference: draft-ietf-idr-bgp-prefix-sid. Parameters" registry, Reference: draft-ietf-idr-bgp-prefix-sid.
Initially, this 16-bit flags registry will be empty. Flag bits will Initially, this 16-bit flags registry will be empty. The
be allocated First Come First Served (FCFS) consistent with the BGP registration policy for flag bits will Expert Review [RFC8126]
Prefix-SID TLV Types registry. consistent with the BGP Prefix-SID TLV Types registry.
Finally, this document requests creation of the "BGP Prefix-SID Finally, this document requests creation of the "BGP Prefix-SID
Originator SRGB TLV Flags" registry under the "Border Gateway Originator SRGB TLV Flags" registry under the "Border Gateway
Protocol (BGP) Parameters" registry, Reference: draft-ietf-idr-bgp- Protocol (BGP) Parameters" registry, Reference: draft-ietf-idr-bgp-
prefix-sid. Initially, this 16-bit flags registry will be empty. prefix-sid. Initially, this 16-bit flags registry will be empty.
Flag bits will be allocated First Come First Served (FCFS) consistent The registration policy for flag bits will Expert Review [RFC8126]
with the BGP Prefix-SID TLV Types registry. consistent with the BGP Prefix-SID TLV Types registry.
8. Manageability Considerations 8. Manageability Considerations
This document defines a BGP attribute to address use cases such as This document defines a BGP attribute to address use cases such as
the one described in [I-D.ietf-spring-segment-routing-msdc]. It is the one described in [I-D.ietf-spring-segment-routing-msdc]. It is
assumed that advertisement of the BGP Prefix-SID attribute is assumed that advertisement of the BGP Prefix-SID attribute is
controlled by the operator in order to: controlled by the operator in order to:
o Prevent undesired origination/advertisement of the BGP Prefix-SID o Prevent undesired origination/advertisement of the BGP Prefix-SID
attribute. By default, a BGP Prefix-SID attribute SHOULD NOT be attribute. By default, a BGP Prefix-SID attribute SHOULD NOT be
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[RFC7606] Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K. [RFC7606] Chen, E., Ed., Scudder, J., Ed., Mohapatra, P., and K.
Patel, "Revised Error Handling for BGP UPDATE Messages", Patel, "Revised Error Handling for BGP UPDATE Messages",
RFC 7606, DOI 10.17487/RFC7606, August 2015, RFC 7606, DOI 10.17487/RFC7606, August 2015,
<https://www.rfc-editor.org/info/rfc7606>. <https://www.rfc-editor.org/info/rfc7606>.
[RFC7911] Walton, D., Retana, A., Chen, E., and J. Scudder, [RFC7911] Walton, D., Retana, A., Chen, E., and J. Scudder,
"Advertisement of Multiple Paths in BGP", RFC 7911, "Advertisement of Multiple Paths in BGP", RFC 7911,
DOI 10.17487/RFC7911, July 2016, <https://www.rfc- DOI 10.17487/RFC7911, July 2016, <https://www.rfc-
editor.org/info/rfc7911>. editor.org/info/rfc7911>.
[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>.
[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>.
[RFC8205] Lepinski, M., Ed. and K. Sriram, Ed., "BGPsec Protocol [RFC8205] Lepinski, M., Ed. and K. Sriram, Ed., "BGPsec Protocol
Specification", RFC 8205, DOI 10.17487/RFC8205, September Specification", RFC 8205, DOI 10.17487/RFC8205, September
2017, <https://www.rfc-editor.org/info/rfc8205>. 2017, <https://www.rfc-editor.org/info/rfc8205>.
[RFC8277] Rosen, E., "Using BGP to Bind MPLS Labels to Address [RFC8277] Rosen, E., "Using BGP to Bind MPLS Labels to Address
Prefixes", RFC 8277, DOI 10.17487/RFC8277, October 2017, Prefixes", RFC 8277, DOI 10.17487/RFC8277, October 2017,
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