Re: [trill] DRB Election Holding Time?

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Thu, 02 August 2012 22:43 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Donald Eastlake <d3e3e3@gmail.com>, Arnel Lim <ALim@extremenetworks.com>
Thread-Topic: [trill] DRB Election Holding Time?
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Date: Thu, 2 Aug 2012 22:43:07 +0000
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Cc: "trill@ietf.org" <trill@ietf.org>
Subject: Re: [trill] DRB Election Holding Time?
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ISO 10589 Section 8.4.1d states:

d)	After waiting iSISHelloTimer × 2 seconds, run the Level 1 and or the level 2 designated intermediate system election process depending on the Intermediate system type.

This is an initial delay designed to allow acquisition of all the neighbors on the LAN before running the first election. Running the initial election upon acquisition of the first new neighbor would obviously result in inconsistent results until all neighbors were acquired.

RFC 6325 does not speak to this point explicitly (or at least I did not find any language) but I would assume a prudent implementation of DRB election would follow this same rule.

   Les

> -----Original Message-----
> From: trill-bounces@ietf.org [mailto:trill-bounces@ietf.org] On Behalf Of
> Donald Eastlake
> Sent: Wednesday, August 01, 2012 10:39 PM
> To: Arnel Lim
> Cc: trill@ietf.org
> Subject: Re: [trill] DRB Election Holding Time?
> 
> There is an inhibition time before it will perform Appointed Forwarder
> ingress and egress functions (see RFC 6439) but no delay for other DRB
> functions.
> 
> Thanks,
> Donald
> =============================
>  Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
>  155 Beaver Street, Milford, MA 01757 USA
>  d3e3e3@gmail.com
> 
> 
> On Wed, Aug 1, 2012 at 11:31 PM, Arnel Lim <ALim@extremenetworks.com> wrote:
> > Is there any holding time during the DRB election process where an RBridge
> > must wait before becoming the DRB?
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