draft-ietf-ospf-segment-routing-msd-23.txt   draft-ietf-ospf-segment-routing-msd-24.txt 
OSPF Working Group J. Tantsura OSPF Working Group J. Tantsura
Internet-Draft Apstra, Inc. Internet-Draft Apstra, Inc.
Intended status: Standards Track U. Chunduri Intended status: Standards Track U. Chunduri
Expires: April 15, 2019 Huawei Technologies Expires: April 20, 2019 Huawei Technologies
S. Aldrin S. Aldrin
Google, Inc Google, Inc
P. Psenak P. Psenak
Cisco Systems Cisco Systems
October 12, 2018 October 17, 2018
Signaling MSD (Maximum SID Depth) using OSPF Signaling MSD (Maximum SID Depth) using OSPF
draft-ietf-ospf-segment-routing-msd-23 draft-ietf-ospf-segment-routing-msd-24
Abstract Abstract
This document defines a way for an Open Shortest Path First (OSPF) This document defines a way for an Open Shortest Path First (OSPF)
Router to advertise multiple types of supported Maximum SID(Segment Router to advertise multiple types of supported Maximum SID(Segment
Identifier) Depths (MSDs) at node and/or link granularity. Such Identifier) Depths (MSDs) at node and/or link granularity. Such
advertisements allow entities (e.g., centralized controllers) to advertisements allow entities (e.g., centralized controllers) to
determine whether a particular SID stack can be supported in a given determine whether a particular SID stack can be supported in a given
network. This document defines only one type of MSD, but defines an network. This document defines only one type of MSD, but defines an
encoding that can support other MSD types. Here the term OSPF means encoding that can support other MSD types. Here the term OSPF means
skipping to change at page 1, line 42 skipping to change at page 1, line 42
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 15, 2019. This Internet-Draft will expire on April 20, 2019.
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 5, line 5 skipping to change at page 5, line 5
Figure 1: Node MSD TLV Figure 1: Node MSD TLV
Type: TBD1 Type: TBD1
Length: variable (multiple of 2 octets) and represents the total Length: variable (multiple of 2 octets) and represents the total
length of value field in octets. length of value field in octets.
Value: consists of one or more pairs of a 1 octet MSD-type and 1 Value: consists of one or more pairs of a 1 octet MSD-type and 1
octet MSD-Value. octet MSD-Value.
MSD-Type: one of the values defined in the IGP MSD Types registry MSD-Type: one of the values defined in the IGP MSD-Types registry
defined in [I-D.ietf-isis-segment-routing-msd]. defined in [I-D.ietf-isis-segment-routing-msd].
MSD-Value: a number in the range of 0-255. For all MSD-Types, 0 MSD-Value: a number in the range of 0-255. For all MSD-Types, 0
represents lack of the ability to impose MSD stack of any depth; any represents lack of the ability to impose MSD stack of any depth; any
other value represents that of the node. This value MUST represent other value represents that of the node. This value MUST represent
the lowest value supported by any link configured for use by the the lowest value supported by any link configured for use by the
advertising OSPF instance. advertising OSPF instance.
This TLV is applicable to OSPFv2 and to OSPFv3 and is optional. The This TLV is applicable to OSPFv2 and to OSPFv3 and is optional. The
scope of the advertisement is specific to the deployment. scope of the advertisement is specific to the deployment.
skipping to change at page 6, line 18 skipping to change at page 6, line 18
For OSPFv3, the Link level MSD-Value is advertised as an optional For OSPFv3, the Link level MSD-Value is advertised as an optional
Sub-TLV of the E-Router-LSA TLV as defined in [RFC8362], and has a Sub-TLV of the E-Router-LSA TLV as defined in [RFC8362], and has a
type of TBD3. type of TBD3.
Length: variable and same as defined in Section 2. Length: variable and same as defined in Section 2.
Value: consists of one or more pairs of a 1 octet MSD-type and 1 Value: consists of one or more pairs of a 1 octet MSD-type and 1
octet MSD-Value. octet MSD-Value.
MSD-Type: one of the values defined in the MSD Types registry defined MSD-Type: one of the values defined in the MSD-Types registry defined
in [I-D.ietf-isis-segment-routing-msd]. in [I-D.ietf-isis-segment-routing-msd].
MSD-Value field contains Link MSD of the router originating the MSD-Value field contains Link MSD of the router originating the
corresponding LSA as specified for OSPFv2 and OSPFv3. Link MSD is a corresponding LSA as specified for OSPFv2 and OSPFv3. Link MSD is a
number in the range of 0-255. For all MSD-Types, 0 represents lack number in the range of 0-255. For all MSD-Types, 0 represents lack
of the ability to impose MSD stack of any depth; any other value of the ability to impose MSD stack of any depth; any other value
represents that of the particular link when used as an outgoing represents that of the particular link when used as an outgoing
interface. interface.
If this sub-TLV is advertised multiple times in the same OSPFv2 If this sub-TLV is advertised multiple times in the same OSPFv2
 End of changes. 6 change blocks. 
6 lines changed or deleted 6 lines changed or added

This html diff was produced by rfcdiff 1.47. The latest version is available from http://tools.ietf.org/tools/rfcdiff/