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Re: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-sbfd-discriminator-00

Uma Chunduri <uma.chunduri@ericsson.com> Thu, 21 August 2014 06:59 UTC

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From: Uma Chunduri <uma.chunduri@ericsson.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@rawdofmt.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>
Thread-Topic: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-sbfd-discriminator-00
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Date: Thu, 21 Aug 2014 06:59:34 +0000
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Cc: Hannes Gredler <hannes@juniper.net>
Subject: Re: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-sbfd-discriminator-00
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Les,

In-line [Uma1]:

===
> Support this.
> 
> Qs:
> 
> 1. What happened to the discussion on-  if this discriminator is a 
> link property or node property as defined (asked originally in OSPF WG 
> by Hannes).

The question was answered - discriminators are a node property.

[Uma1]: I saw SR use cases for SBFD and with ADJ-SID's (link specific)  this can be a problem.

> 2. If MTs are on the same physical topology, I don't see the 
> association of Discriminator to the logical topology/MT.  Is it 
> already though and discounted ? If yes rationale will be helpful.

Just as IP/IPv6 addresses are NOT topology specific, S-BFD discriminators are NOT topology specific. The paths to reach a node may differ between topologies - but that is not a property of the discriminator.

[Uma1]:  A node may  be part of any  logical topology (MT) or may not be. 
But, if the discriminator doesn't represent the same then the receiving node (participating in multiple logical topologies) has no idea  for which topo the same has been received or
In other words  sending node may not be part of the particular logical topo.

Do you see this as an issue?

--
Uma C.

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