[c-nsp] Maximum number of VRF-Lite instances in ISR G2 routers

[John Kougoulos]

On Wed, 13 Jul 2011, Peter Rathlev wrote:

> On Wed, 2011-07-13 at 10:01 +0200, Matteo Castelli ML wrote:
>> I am starting a project to implement VRF-lite for some customers,
>> does anybody know (or have a link to some Cisco documentation) the
>> maximum number of VRF-lite instances in the different ISR G2 routers
>> models of Cisco?
>
> I tried creating a bunch of VRFs on a plain 2801 with 128M RAM running
> 12.4(24)T3 Enterprise Base. It's not a G2, but the results should not be
> worse.
>
> It seems that the number of VRFs is only limited by memory. Statistics
> for processor memory:
>
> #VRFs   Total(b)  Used(b)  Free(b) Lowest(b) Largest(b)
>   300   55234624 33762740 21471884  21387108   21400832
>   400   55234624 38923612 16311012  16234112   16255268
>   500   55234624 44236524 10998100  10934664   10919836
>   600   55234624 49404172  5830452   5754544    5763496
>   700   55234624 54614228   620396    557736     555396
>

If I remember correctly another limitation that affects the number of VRFs 
is the number of software IDBs that are available in each platform.

"show idb" will show how many are available, and how they are used.

Regards,
John