The announcement prompted me to look again and think about an
interaction between this and the network programming draft. To be
clear, I am NOT objecting to either this or the network programming
draft. I am just wondering what I am missing.
The NP draft, and the advertisement mechanism allows a router to
advertise the number of bits for the ARG portion of a SID.
Q1: The point presumably is to avoid needing to advertise each of the
individual values?
An example of this is, I think, and ARG for the table selection where
the ARG is the table number for the packet to be looked up in?
Q2: If so, how does the head end know what table number corresponds to
what meaning? If this requires a separate advertisement there seems
to be no savings. if this requires out-of-band knowledge then we seem
to have lost the benefit of advertising all of this in the routing protocol.
I suspect I am simply missing a piece. can someone explain please?
Thank you,
Joel
On 9/23/2020 4:40 PM, internet-dra...@ietf.org wrote:
A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.
Title : IS-IS Extension to Support Segment Routing over IPv6
Dataplane
Authors : Peter Psenak
Clarence Filsfils
Ahmed Bashandy
Bruno Decraene
Zhibo Hu
Filename : draft-ietf-lsr-isis-srv6-extensions-10.txt
Pages : 25
Date : 2020-09-23
Abstract:
Segment Routing (SR) allows for a flexible definition of end-to-end
paths by encoding paths as sequences of topological sub-paths, called
"segments". Segment routing architecture can be implemented over an
MPLS data plane as well as an IPv6 data plane. This draft describes
the IS-IS extensions required to support Segment Routing over an IPv6
data plane.
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