draft-ietf-ospf-segment-routing-msd-19.txt   draft-ietf-ospf-segment-routing-msd-20.txt 
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Internet-Draft Nuage Networks Internet-Draft Nuage Networks
Intended status: Standards Track U. Chunduri Intended status: Standards Track U. Chunduri
Expires: March 4, 2019 Huawei Technologies Expires: March 4, 2019 Huawei Technologies
S. Aldrin S. Aldrin
Google, Inc Google, Inc
P. Psenak P. Psenak
Cisco Systems Cisco Systems
August 31, 2018 August 31, 2018
Signaling MSD (Maximum SID Depth) using OSPF Signaling MSD (Maximum SID Depth) using OSPF
draft-ietf-ospf-segment-routing-msd-19 draft-ietf-ospf-segment-routing-msd-20
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 Depths Router to advertise multiple types of supported Maximum SID Depths
(MSDs) at node and/or link granularity. Such advertisements allow (MSDs) at node and/or link granularity. Such advertisements allow
entities (e.g., centralized controllers) to determine whether a entities (e.g., centralized controllers) to determine whether a
particular SID stack can be supported in a given network. This particular SID stack can be supported in a given network. This
document defines only one type of MSD, but defines an encoding that document defines only one type of MSD, but defines an encoding that
can support other MSD types. Here the term OSPF means both OSPFv2 can support other MSD types. Here the term OSPF means both OSPFv2
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If this sub-TLV is advertised multiple times in the same OSPFv2 If this sub-TLV is advertised multiple times in the same OSPFv2
Extended Link Opaque LSA/E-Router-LSA, only the first instance of the Extended Link Opaque LSA/E-Router-LSA, only the first instance of the
TLV MUST be used by receiving OSPF routers. This situation SHOULD be TLV MUST be used by receiving OSPF routers. This situation SHOULD be
logged as an error. logged as an error.
If this sub-TLV is advertised multiple times for the same link in If this sub-TLV is advertised multiple times for the same link in
different OSPF Extended Link Opaque LSAs/E-Router-LSAs originated by different OSPF Extended Link Opaque LSAs/E-Router-LSAs originated by
the same OSPF router, the OSPFv2 Extended Link TLV in the OSPFv2 the same OSPF router, the OSPFv2 Extended Link TLV in the OSPFv2
Extended Link Opaque LSA with the smallest Opaque ID or in the OSPFv3 Extended Link Opaque LSA with the smallest Opaque ID or in the OSPFv3
E-Router-LSA with the smallest Link State ID MUSR be used by E-Router-LSA with the smallest Link State ID MUST be used by
receiving OSPF routers. This situation MAY be logged as a warning. receiving OSPF routers. This situation MAY be logged as a warning.
4. Using Node and Link MSD Advertisements 4. Using Node and Link MSD Advertisements
When Link MSD is present for a given MSD type, the value of the Link When Link MSD is present for a given MSD type, the value of the Link
MSD MUST take preference over the Node MSD. When a Link MSD type is MSD MUST take preference over the Node MSD. When a Link MSD type is
not signalled but the Node MSD type is, then the value of that Node not signalled but the Node MSD type is, then the value of that Node
MSD type MUST be considered as the corresponding Link MSD type value. MSD type MUST be considered as the corresponding Link MSD type value.
In order to increase flooding efficiency, it is RECOMMENDED, that In order to increase flooding efficiency, it is RECOMMENDED, that
routers with homogenous Link MSD values advertise just the Node MSD routers with homogenous Link MSD values advertise just the Node MSD
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