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Re: [Tsvwg] SCTP applicability statement

Allison Mankin <mankin@isi.edu> Sun, 04 November 2001 21:35 UTC

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To: bidulock@openss7.org
cc: RJ Atkinson <rja@inet.org>, sigtran <sigtran@lyris.nortelnetworks.com>, "Transport Area wg (E-mail)" <tsvwg@ietf.org>
Reply-To: mankin@isi.edu
Subject: Re: [Tsvwg] SCTP applicability statement
In-reply-to: Your message of Sun, 04 Nov 2001 14:58:19 -0600. <20011104145819.F3223@openss7.org>
Date: Sun, 04 Nov 2001 16:22:14 -0500
From: Allison Mankin <mankin@isi.edu>
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> Does SCTP support failover between multi-homed hosts?
> 
> 
> Is failover between multi-homed hosts within the scope of SCTP?

Brian,

SCTP's multi-homing has no relation to anything between*
hosts, only between interfaces of one host.  There might be
some kind of cluster that appears to its SCTP peer be one host 
with multiple interfaces, but it would not be within the scope
of SCTP to know about the cluster. 

In draft-ietf-aaa-transport-04.txt, section 3.2. there's a 
good discussion of failover/failback, which distinguishes
among:

- what a cluster does in its cluster OS or cluster communication
  system 
- what application-level watchdogs do, where the failover is among
  multiple potential peers (here AAA servers)
- what SCTP does

If all interfaces of an SCTP host are down, that's the second case.

Allison

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