[c-nsp] VRF Limitations/OSPF Process Limitations on 3550/3560

[Ben Basler (bbasler)]

Mike,

Here's a nice summary:
http://www.cisco.com/en/US/prod/collateral/netmgtsw/ps6504/ps6528/ps2425
/white_paper_c11-541238-00.html#wp9000264 

As for limitations there are two things to consider:

- HW resources (you're hitting this for both platforms you mention)
- SW limits - there used to be a 28 process limit but this has gone a
long time ago (for Catalyst 6500 this got lifted as of the 12.2(18)SXE
release).
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/na
tive/release/notes/OL_4164.html#wp2087620 

Cheers,
Ben

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Peter Rathlev
> Sent: Monday, December 07, 2009 10:08 AM
> To: Mike Kiefer
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] VRF Limitations/OSPF Process Limitations on
3550/3560
> 
> On Mon, 2009-12-07 at 10:23 -0600, Mike Kiefer wrote:
> > Are there currently any limitations on running VRF lite with an OSPF
> > process per VRF on this hardware? I was told by a coworker that
> > 3550/3560's have an extremely low limit. Something like 4 or 5
> > vrfs/OSPF processes. This doesn't seem right.
> 
> The 3550 can handle 7 VRFs. The 3560 can handle 26 VRFs.
> 
> When trying to create #8 on a 3550 it logs this:
> 
>  %L3TCAM-3-TOO_MANY_VRF: The maximum number of VRFs allowed has been
exceeded
> 
> It will still create the VRF but no let you assign an RD and it won't
> work.
> 
> On a 3560 running the CLI will not let you create more that 26 VRFs;
> attempting to create the 27th results in a CLI error:
> 
>  [...]
>  Switch(config)#ip vrf test27
>  % Can't create VRF test27
>  Switch(config)#
> 
> The limitation seems to lie in the TCAM programming.
> 
> --
> Peter
> 
> 
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