[c-nsp] Full net table too large for Sup720 already?

[Afsheen Bigdeli]

 From this post:

http://puck.nether.net/pipermail/cisco-nsp/2006-August/032846.html

It appears that the magic number, assuming you've tweaked the TCAM 
appropriately, is somewhere between 244736 to 245546 routes.

I'd be interested to see what (if anything) happens when that number is 
reached.

--afsheenb




jim bartus wrote:
> I don't claim to be an expert but I looked into this before and here's
> what I found:
> http://www.nanog.org/mtg-0702/presentations/fib-desilva.pdf
> 
> check out page 8, page 10, and the first bullet point on page 15.
> 
> Page 10 says the limit on a 3B is 192k by default but can be tweaked up to 239K.
> 
> According to the "Weekly Routing Table Report" cisco posts to nanog
> the number currently out there in a full internet bgp feed is 234760.
> http://thyme.apnic.net/ap-data/2007/10/20/0400/weekly
> 
> So if I understand that correctly a default 720-3B will already
> overflow and one that is configured to support the max 239K has less
> than 5K left of headroom.
> 
> poking through those bgp reports here's the trend:
> 2007-05-01:	219238
> 2007-06-01:	221952	+2624
> 2007-07-01:	224395	+2443
> 2007-08-01:	227097	+2702
> 2007-09-01:	229742	+2645
> 2007-10-01:	233290	+3548
> 
> I read that as saying 3B owners have less than 2 months left until
> they can't fit a full bgp table in tcam.  Thats not counting any
> local/igp routes or arp entries.
> 
> If I'm reading right, in about a month c-nsp and nanog will be
> inundated with "ow my cpu" posts.
> 
> -jim
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