[c-nsp] 6500 iBGP mesh

[Oliver Dewdney]

How would one get assurances that Cisco are going to address this issue,
when in two years time we reach ~240k routes, and when it can be fixed in
software by aggregating the routes? Taking our Level 3 BGP feed of 189k
routes I can reduce it down to 46k routes by aggregating routes into bigger
prefixes. Doing this should also improve software forwarding as well as it
should be a shallower search.

Oli Dewdney
LBIcon

-----Original Message-----
From: Bruce Pinsky [mailto:bep at whack.org] 
Sent: 14 August 2006 10:06
To: Francois Corthésy
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 6500 iBGP mesh


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Hash: SHA1

Francois Corthésy wrote:
> Might I point out that it seems the Sup32/Sup720 line (except for the
> Sup720-3BXL) have a limitation based on their forwarding chip to about 
> 239K routes. I'm no guru, but this was pointed out in a thread earlier 
> on and sadly confirmed through a Cisco TAC.
> Earlier discussion :
> https://puck.nether.net/pipermail/cisco-nsp/2006-August/032814.html
> 

That's 239K routes in the RIB/FIB due to TCAM limitations.  There are only
~190K routes currently in the DFZ and having multiple views/paths for those
routes is only affected by the amount of memory (DRAM) installed, not the
TCAM limitations.

- --
=========
bep

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