[c-nsp] 7505, OC3s and BGP

[Bill Wichers]

> If you are pulling in full tables you'll want 256MB in the VIPs.  I
> had a 12k with 128MB LCs that would stop CEF because they ran out of
> RAM.   no CEF on a 12k is bad ( no routing from that LC),  no CEF on
> a VIP is bad (punts to the RSP).  You can filter out your BGP table
> to drop the memory requirements dramatically.

I've been able to get two full views on a 75xx w/ RSP4, but we have two
routers, one for each peer, so we have "distributed filtering" in a sense
and neither router sees every route. I would think 2 views would still fit
on the VIP2-50's with 128MB RAM though since we show a lot free. I doubt
you could fit more than 2 full views though.

> Does the VIP2-50 support 256MB RAM?  You may want VIP4-80s.   When I
> looked at doing this a year ago I came to the conclusion that
> upgrading to a used 12k made more sense.

AFAIK, 128MB is the max for DRAM on a VIP2-50. I looked for a trick like
there was on the VIP2-40 (64MB fit and worked even though 32MB was the
"max"), but haven't ever found any indication a VIP2-50 can use more than
128MB.

We are also in the process of moving to used 12k's, due mainly to concerns
about memory and the need for gigE and OC12+ circuits. Too bad the GRP-B
is EOL already though.

     -Bill

*****************************
Waveform Technology
Systems Engineer