draft-ietf-isis-segment-routing-extensions-17.txt   draft-ietf-isis-segment-routing-extensions-18.txt 
IS-IS for IP Internets S. Previdi, Ed. IS-IS for IP Internets S. Previdi, Ed.
Internet-Draft L. Ginsberg, Ed. Internet-Draft L. Ginsberg, Ed.
Intended status: Standards Track C. Filsfils Intended status: Standards Track C. Filsfils
Expires: December 17, 2018 Cisco Systems, Inc. Expires: December 22, 2018 Cisco Systems, Inc.
A. Bashandy A. Bashandy
H. Gredler H. Gredler
RtBrick Inc. RtBrick Inc.
S. Litkowski S. Litkowski
B. Decraene B. Decraene
Orange Orange
J. Tantsura J. Tantsura
Nuage Networks Nuage Networks
June 15, 2018 June 20, 2018
IS-IS Extensions for Segment Routing IS-IS Extensions for Segment Routing
draft-ietf-isis-segment-routing-extensions-17 draft-ietf-isis-segment-routing-extensions-18
Abstract Abstract
Segment Routing (SR) allows for a flexible definition of end-to-end Segment Routing (SR) allows for a flexible definition of end-to-end
paths within IGP topologies by encoding paths as sequences of paths within IGP topologies by encoding paths as sequences of
topological sub-paths, called "segments". These segments are topological sub-paths, called "segments". These segments are
advertised by the link-state routing protocols (IS-IS and OSPF). advertised by the link-state routing protocols (IS-IS and OSPF).
This draft describes the necessary IS-IS extensions that need to be This draft describes the necessary IS-IS extensions that need to be
introduced for Segment Routing operating on an MPLS data-plane. introduced for Segment Routing operating on an MPLS data-plane.
skipping to change at page 2, line 10 skipping to change at page 2, line 10
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 December 17, 2018. This Internet-Draft will expire on December 22, 2018.
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
(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 14, line 25 skipping to change at page 14, line 25
Type: TBD, suggested value 1 Type: TBD, suggested value 1
Length: variable Length: variable
SID/Label: if length is set to 3 then the 20 rightmost bits SID/Label: if length is set to 3 then the 20 rightmost bits
represent a MPLS label. represent a MPLS label.
2.4. SID/Label Binding TLV 2.4. SID/Label Binding TLV
The SID/Label Binding TLV MAY be originated by any router in an IS-IS The SID/Label Binding TLV MAY be originated by any router in an IS-IS
domain. domain. There are multiple uses of the SID/Label Binding TLV.
The SID/Label Binding TLV is used to advertise prefixes to SID/Label The SID/Label Binding TLV may be used to advertise prefixes to SID/
mappings. This functionality is called the Segment Routing Mapping Label mappings. This functionality is called the Segment Routing
Server (SRMS). The behavior of the SRMS is defined in Mapping Server (SRMS). The behavior of the SRMS is defined in
[I-D.ietf-spring-segment-routing-ldp-interop]. [I-D.ietf-spring-segment-routing-ldp-interop].
The SID/Label BInding TLV may also be used to advertise a Mirror SID
to advertise the ability to process traffic originally destined to
another IGP node. This behavior is defined in
[I-D.ietf-spring-segment-routing].
The SID/Label Binding TLV has Type TBD (suggested value 149), and has The SID/Label Binding TLV has Type TBD (suggested value 149), and has
the following format: the following format:
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 | Flags | RESERVED | | Type | Length | Flags | RESERVED |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Range | Prefix Length | Prefix | | Range | Prefix Length | Prefix |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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