draft-ietf-ospf-segment-routing-extensions-21.txt   draft-ietf-ospf-segment-routing-extensions-22.txt 
Open Shortest Path First IGP P. Psenak, Ed. Open Shortest Path First IGP P. Psenak, Ed.
Internet-Draft S. Previdi, Ed. Internet-Draft S. Previdi, Ed.
Intended status: Standards Track C. Filsfils Intended status: Standards Track C. Filsfils
Expires: April 27, 2018 Cisco Systems, Inc. Expires: May 31, 2018 Cisco Systems, Inc.
H. Gredler H. Gredler
RtBrick Inc. RtBrick Inc.
R. Shakir R. Shakir
Google, Inc. Google, Inc.
W. Henderickx W. Henderickx
Nokia Nokia
J. Tantsura J. Tantsura
Individual Individual
October 24, 2017 November 27, 2017
OSPF Extensions for Segment Routing OSPF Extensions for Segment Routing
draft-ietf-ospf-segment-routing-extensions-21 draft-ietf-ospf-segment-routing-extensions-22
Abstract Abstract
Segment Routing (SR) allows a flexible definition of end-to-end paths Segment Routing (SR) allows a flexible definition of end-to-end paths
within IGP topologies by encoding paths as sequences of topological within IGP topologies by encoding paths as sequences of topological
sub-paths, called "segments". These segments are advertised by the sub-paths, called "segments". These segments are advertised by the
link-state routing protocols (IS-IS and OSPF). link-state routing protocols (IS-IS and OSPF).
This draft describes the OSPF extensions required for Segment This draft describes the OSPF extensions required for Segment
Routing. Routing.
skipping to change at page 2, line 4 skipping to change at page 2, line 4
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 27, 2018. This Internet-Draft will expire on May 31, 2018.
Copyright Notice Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the Copyright (c) 2017 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
(https://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
skipping to change at page 10, line 35 skipping to change at page 10, line 35
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | | Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Preference | Reserved | | Preference | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where: where:
Type: 13 Type: 15
Length: 4 octets Length: 4 octets
Preference: 1 octet. SRMS preference value from 0 to 255. Preference: 1 octet. SRMS preference value from 0 to 255.
When multiple SRMS Preference TLVs are received from a given router, When multiple SRMS Preference TLVs are received from a given router,
the receiver SHOULD use the first occurrence of the TLV in the Router the receiver SHOULD use the first occurrence of the TLV in the Router
Information LSA. If the SRMS Preference TLV appears in multiple Information LSA. If the SRMS Preference TLV appears in multiple
Router Information LSAs that have different flooding scopes, the SRMS Router Information LSAs that have different flooding scopes, the SRMS
Preference TLV in the Router Information LSA with the narrowest Preference TLV in the Router Information LSA with the narrowest
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8. IANA Considerations 8. IANA Considerations
This specification updates several existing OSPF registries. This specification updates several existing OSPF registries.
8.1. OSPF OSPF Router Information (RI) TLVs Registry 8.1. OSPF OSPF Router Information (RI) TLVs Registry
o 8 (IANA Preallocated) - SR-Algorithm TLV o 8 (IANA Preallocated) - SR-Algorithm TLV
o 9 (IANA Preallocated) - SID/Label Range TLV o 9 (IANA Preallocated) - SID/Label Range TLV
o 13 - SRMS Preference TLV
o 14 - SR Local Block TLV o 14 - SR Local Block TLV
o 15 - SRMS Preference TLV
8.2. OSPF Extended Prefix LSA TLV Registry 8.2. OSPF Extended Prefix LSA TLV Registry
Following values are allocated: Following values are allocated:
o 2 - OSPF Extended Prefix Range TLV o 2 - OSPF Extended Prefix Range TLV
8.3. OSPF Extended Prefix LSA Sub-TLV Registry 8.3. OSPF Extended Prefix LSA Sub-TLV Registry
Following values are allocated: Following values are allocated:
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Following initial values are allocated: Following initial values are allocated:
o 1 - SID/Label Sub-TLV o 1 - SID/Label Sub-TLV
o 2 - Adj-SID Sub-TLV o 2 - Adj-SID Sub-TLV
o 3 - LAN Adj-SID/Label Sub-TLV o 3 - LAN Adj-SID/Label Sub-TLV
8.5. IGP Algorithm Type Registry 8.5. IGP Algorithm Type Registry
IANA is requested to set up a registry called "IGP Algorithm Type". IANA is requested to set up a registry called "IGP Algorithm Type"
The registration policy for this registry is "Standards Action" under a new category of "Interior Gateway Protocol (IGP) Parameters"
([RFC8126] and [RFC7120]). IANA registries. The registration policy for this registry is
"Standards Action" ([RFC8126] and [RFC7120]).
Values in this registry must come from the range 0-255. Values in this registry must come from the range 0-255.
The initial values in the IGP Algorithm Type registry are: The initial values in the IGP Algorithm Type registry are:
0: Shortest Path First (SPF) algorithm based on link metric. This 0: Shortest Path First (SPF) algorithm based on link metric. This
is the standard shortest path algorithm as computed by the IGP is the standard shortest path algorithm as computed by the IGP
protocol. Consistent with the deployed practice for link-state protocol. Consistent with the deployed practice for link-state
protocols, Algorithm 0 permits any node to overwrite the SPF path protocols, Algorithm 0 permits any node to overwrite the SPF path
with a different path based on its local policy. with a different path based on its local policy.
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We would like to thank Anton Smirnov for his contribution. We would like to thank Anton Smirnov for his contribution.
Thanks to Acee Lindem for the detail review of the draft, Thanks to Acee Lindem for the detail review of the draft,
corrections, as well as discussion about details of the encoding. corrections, as well as discussion about details of the encoding.
13. References 13. References
13.1. Normative References 13.1. Normative References
[I-D.ietf-spring-segment-routing] [I-D.ietf-spring-segment-routing]
Filsfils, C., Previdi, S., Decraene, B., Litkowski, S., Filsfils, C., Previdi, S., Ginsberg, L., Decraene, B.,
and R. Shakir, "Segment Routing Architecture", draft-ietf- Litkowski, S., and R. Shakir, "Segment Routing
spring-segment-routing-12 (work in progress), June 2017. Architecture", draft-ietf-spring-segment-routing-13 (work
in progress), October 2017.
[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, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC4915] Psenak, P., Mirtorabi, S., Roy, A., Nguyen, L., and P. [RFC4915] Psenak, P., Mirtorabi, S., Roy, A., Nguyen, L., and P.
Pillay-Esnault, "Multi-Topology (MT) Routing in OSPF", Pillay-Esnault, "Multi-Topology (MT) Routing in OSPF",
RFC 4915, DOI 10.17487/RFC4915, June 2007, RFC 4915, DOI 10.17487/RFC4915, June 2007,
<https://www.rfc-editor.org/info/rfc4915>. <https://www.rfc-editor.org/info/rfc4915>.
skipping to change at page 27, line 14 skipping to change at page 27, line 20
[I-D.ietf-spring-segment-routing-ldp-interop] [I-D.ietf-spring-segment-routing-ldp-interop]
Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., and Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., and
S. Litkowski, "Segment Routing interworking with LDP", S. Litkowski, "Segment Routing interworking with LDP",
draft-ietf-spring-segment-routing-ldp-interop-09 (work in draft-ietf-spring-segment-routing-ldp-interop-09 (work in
progress), September 2017. progress), September 2017.
[I-D.ietf-spring-segment-routing-mpls] [I-D.ietf-spring-segment-routing-mpls]
Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., Filsfils, C., Previdi, S., Bashandy, A., Decraene, B.,
Litkowski, S., and R. Shakir, "Segment Routing with MPLS Litkowski, S., and R. Shakir, "Segment Routing with MPLS
data plane", draft-ietf-spring-segment-routing-mpls-10 data plane", draft-ietf-spring-segment-routing-mpls-11
(work in progress), June 2017. (work in progress), October 2017.
[RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328,
DOI 10.17487/RFC2328, April 1998, DOI 10.17487/RFC2328, April 1998,
<https://www.rfc-editor.org/info/rfc2328>. <https://www.rfc-editor.org/info/rfc2328>.
[RFC7474] Bhatia, M., Hartman, S., Zhang, D., and A. Lindem, Ed., [RFC7474] Bhatia, M., Hartman, S., Zhang, D., and A. Lindem, Ed.,
"Security Extension for OSPFv2 When Using Manual Key "Security Extension for OSPFv2 When Using Manual Key
Management", RFC 7474, DOI 10.17487/RFC7474, April 2015, Management", RFC 7474, DOI 10.17487/RFC7474, April 2015,
<https://www.rfc-editor.org/info/rfc7474>. <https://www.rfc-editor.org/info/rfc7474>.
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