[c-nsp] How many maximum routes does Cisco 2900 router support?

Robert Hass robhass at gmail.com
Thu Jan 7 09:20:09 EST 2016

On Thu, Jan 7, 2016 at 9:00 AM, Patrick M. Hausen <hausen at punkt.de> wrote:

> > However, I suspect CPU resources and route convergence time would be
> more of the limiting factor than absolute route count.
> We've been running IPv4 full tables with two 3825 for a couple of years. 1
> GB of RAM,
> which is AFAIK the maximum this platform supports. Switched them for 6500
> just a
> little over a year ago.

It depends what more you have on this 2901. Programming FIB, RIB,
calculating routing is CPU consuming operation. With 2.5GB RAM I don't have
problems putting 1MLN IPv4 routes even in C2901.

If you're looking for small, cheap BGP router for 100Mbps/s link - 2901 is
OK. But be prepared that configuration should be minimum - no NAT, no IPSEC


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