draft-ietf-ospf-segment-routing-msd-06.txt   draft-ietf-ospf-segment-routing-msd-07.txt 
OSPF Working Group J. Tantsura OSPF Working Group J. Tantsura
Internet-Draft Individual Internet-Draft Individual
Intended status: Standards Track U. Chunduri Intended status: Standards Track U. Chunduri
Expires: June 4, 2018 Huawei Technologies Expires: June 17, 2018 Huawei Technologies
S. Aldrin S. Aldrin
Google, Inc Google, Inc
P. Psenak P. Psenak
Cisco Systems Cisco Systems
December 01, 2017 December 14, 2017
Signaling MSD (Maximum SID Depth) using OSPF Signaling MSD (Maximum SID Depth) using OSPF
draft-ietf-ospf-segment-routing-msd-06 draft-ietf-ospf-segment-routing-msd-07
Abstract Abstract
This document proposes a way to signal Maximum SID Depth (MSD) This document proposes a way to signal Maximum SID Depth (MSD)
supported by a node at node and/or link granularity by an OSPF supported by a node at node and/or link granularity by an OSPF
Router. In a Segment Routing (SR) enabled network a centralized Router. In a Segment Routing (SR) enabled network a centralized
controller that programs SR tunnels needs to know the MSD supported controller that programs SR tunnels needs to know the MSD supported
by the head-end at node and/or link granularity to impose the SID by the head-end at node and/or link granularity to impose the SID
stack of an appropriate depth. MSD is relevant to the head-end of a stack of an appropriate depth. MSD is relevant to the head-end of a
SR tunnel or Binding-SID anchor node where Binding-SID expansions SR tunnel or Binding-SID anchor node where Binding-SID expansions
skipping to change at page 1, line 43 skipping to change at page 1, line 43
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 4, 2018. This Internet-Draft will expire on June 17, 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
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5. Node MSD vs Link MSD conflict resolution 5. Node MSD vs Link MSD conflict resolution
When both Node MSD and Link MSD are present, the value in the Link When both Node MSD and Link MSD are present, the value in the Link
MSD MUST be used. MSD MUST be used.
6. IANA Considerations 6. IANA Considerations
This document includes a request to IANA to allocate TLV type codes This document includes a request to IANA to allocate TLV type codes
for the new TLV proposed in Section 3 of this document from OSPF for the new TLV proposed in Section 3 of this document from OSPF
Router Information (RI) TLVs Registry as defined by [RFC4970]. Also Router Information (RI) TLVs Registry as defined by [RFC4970]. For
for link MSD, we request IANA to allocate new sub-TLV codes as THE link MSD, we request IANA to allocate new sub-TLV codes as
proposed in Section 4 from OSPFv2 Extended Link Opaque LSAs Extended proposed in Section 4 from OSPFv2 Extended Link TLV Sub-TLVs registry
Link TLV registry and from Router-Link TLV defined in OSPFv3 Extend- and from Router-Link TLV defined in OSPFv3 Extend-LSA Sub-TLV
LSA Sub-TLV registry. registry.
This document also request IANA to create a new Sub-type registry as This document also requests IANA to create a new Sub-type registry as
proposed in Section 3, Section 4. proposed in Section 3, Section 4.
Value Name Reference Value Name Reference
----- --------------------- ------------- ----- --------------------- -------------
0 Reserved This document 0 Reserved This document
1 Base MSD This document 1 Base MSD This document
2-250 Unassigned This document 2-250 Unassigned This document
251-254 Experimental This document 251-254 Experimental This document
255 Reserved This document 255 Reserved This document
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