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Re: [Sigtran] Number of links towards a DPC (ITU)

"Brian F. G. Bidulock" <bidulock@openss7.org> Mon, 17 June 2013 13:01 UTC

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Date: Mon, 17 Jun 2013 07:01:02 -0600
From: "Brian F. G. Bidulock" <bidulock@openss7.org>
To: David Laight <David.Laight@ACULAB.COM>
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Cc: Arvind Kumar <arvindverma77@gmail.com>, sigtran@ietf.org
Subject: Re: [Sigtran] Number of links towards a DPC (ITU)
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David,

David Laight wrote:                                        (Mon, 17 Jun 2013 11:52:03)
> 
> >From deciding not to do it when fixing our mtp3 routing rules!
> 
> Q.704 section 2.3 states that the routing is based on information
> from the routing label - normally the sls and dpc.
> With 2 linksets of 16 links the 'normal' link assignment could use
> one bit of the sls to select between the linksets and the low bit
> of the dpc and the other 3 bits of the sls to select one of the
> 16 links in the linkset.
> This would be perfectly valid.

Routing not linkset selection.  It is not valid because it does
not lead to an even loadsharing over links.

> 
> Q.705 A is only an example mesh network.
> The appendix is describing the routing under fault conditions.
> 

The network in the figure (using a fixed bit position for
linkset selection) is the common practice for ITU.

-- 
Brian F. G. Bidulock
bidulock@openss7.org
http://www.openss7.org/

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