draft-ietf-ospf-ospfv3-segment-routing-extensions-21.txt   draft-ietf-ospf-ospfv3-segment-routing-extensions-22.txt 
Open Shortest Path First IGP P. Psenak, Ed. Open Shortest Path First IGP P. Psenak, Ed.
Internet-Draft Cisco Systems, Inc. Internet-Draft Cisco Systems, Inc.
Intended status: Standards Track S. Previdi, Ed. Intended status: Standards Track S. Previdi, Ed.
Expires: June 17, 2019 Individual Expires: July 6, 2019 Individual
December 14, 2018 January 2, 2019
OSPFv3 Extensions for Segment Routing OSPFv3 Extensions for Segment Routing
draft-ietf-ospf-ospfv3-segment-routing-extensions-21 draft-ietf-ospf-ospfv3-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 OSPFv3 extensions required for Segment This draft describes the OSPFv3 extensions required for Segment
Routing with MPLS data plane. Routing with MPLS data plane.
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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 June 17, 2019. This Internet-Draft will expire on July 6, 2019.
Copyright Notice Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the Copyright (c) 2019 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
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the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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Segment Routing requires some additional router capabilities to be Segment Routing requires some additional router capabilities to be
advertised to other routers in the area. advertised to other routers in the area.
These SR capabilities are advertised in the OSPFv3 Router Information These SR capabilities are advertised in the OSPFv3 Router Information
Opaque LSA (defined in [RFC7770]) and specified in Opaque LSA (defined in [RFC7770]) and specified in
[I-D.ietf-ospf-segment-routing-extensions]. [I-D.ietf-ospf-segment-routing-extensions].
5. OSPFv3 Extended Prefix Range TLV 5. OSPFv3 Extended Prefix Range TLV
In some cases it is useful to advertise attributes for a range of In some cases it is useful to advertise attributes for a range of
prefixes. The Segment Routing Mapping Server, which is described in prefixes in a single advertisement. The Segment Routing Mapping
Server, which is described in
[I-D.ietf-spring-segment-routing-ldp-interop], is an example of where [I-D.ietf-spring-segment-routing-ldp-interop], is an example of where
a single advertisement is needed to advertise SIDs for multiple SIDs for multiple prefixes can be advertised. To optimize such
prefixes from a contiguous address range. advertisement in case of multiple prefixes from a contiguous address
range, OSPFv3 Extended Prefix Range TLV is defined."
The OSPFv3 Extended Prefix Range TLV is defined for this purpose.
The OSPFv3 Extended Prefix Range TLV is a top-level TLV of the The OSPFv3 Extended Prefix Range TLV is a top-level TLV of the
following LSAs defined in [RFC8362]: following LSAs defined in [RFC8362]:
E-Intra-Area-Prefix-LSA E-Intra-Area-Prefix-LSA
E-Inter-Area-Prefix-LSA E-Inter-Area-Prefix-LSA
E-AS-External-LSA E-AS-External-LSA
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