Re: OT-How many IPV4 routes Cisco 3900 can handle?

On 2009-12-23 15:06, Radioactive Frog wrote:
> I've seen 2811 creshing to death when tried to keep it in production with a
> gig of RAM.

That's propably because 2811 won't take 1GB of RAM, only 768MB[1].
Memory controller limitation, been there, done that - even if it has
1GB it won't detect it, and may behave in uncontrollable fashion - so
don't make judgements on unsupported configurations you have no idea
how behave out of envelope specified by vendor.

> not recommended, for production we have standerdised routers according to
> the traffic/bandwidth.

That's usual professional way of thinking - have the standards and
follow them.

> Is this 2811 you've running full BGP routes in production? I doubt it.

I have a couple of lab 2811 that are equipped with 768MB and are
happy with couple of feeds, fancy IPv6 multiprotocol stuff and other
interesting features. In 768MB you can easily fit three-four full
tables, you may however encounter sluggish console/vty access in
times of convergence (even after BGP ATF integration, the next-hop
tracking optimization, and other features that went into 12.4T).
The RAM consumption if soft-reconfig is not used grows only by
a couple percent with every new table added after the first one,
so it's not that you need 8GB to store 16 tables.

[1].http://cisco.com/en/US/prod/collateral/routers/ps5854/ps5882/product_data_sheet0900aecd8016fa68_ps5854_Products_Data_Sheet.html

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