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

[David Rothera]

It will also depend on how many routes are in each VRF.


David Rothera



On Wed, Jul 13, 2011 at 9:33 AM, Peter Rathlev <peter at rathlev.dk> 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
>
> After the 700th VRF the box logged this:
>
>  005493: Jul 13 10:26:52.299 CEST: %AAA-3-ACCT_LOW_MEM_TRASH: AAA unable
> to handle accounting requests due to insufficient processor memory and
> could be trashing the queued accounting records
>
> Keep in mind that this is a lab test, no traffic et cetera.
>
> My guess is that the raw number of VRFs supported on a G2 would be
> something in the ballpark of 1000 or more. I would also guess that the
> limiting factor would be forwarding performance before number of VRFs. I
> don't have a G2 readily available to test though.
>
> The VRFs were created as:
>
>  ip vrf test<number>
>  rd 1:<number>
>  !
>
> --
> Peter
>
>
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