[c-nsp] Catalyst 6500: IPv6-enabled SVIs

Phil Mayers p.mayers at imperial.ac.uk
Thu Oct 31 08:18:17 EDT 2013

On 31/10/2013 10:50, Владимир Троицкий wrote:
> Hello,
> There is an issue on Cat6500 (SUP720-3B) with a lot of IPv6 SVIs:
> %FM-4-TCAM_LABEL: Hardware TCAM label capacity exceeded.
> #sh tcam counts ipv6
>             Used        Free        Reserved
>             ----        ----        --------
> Labels:(in) 512           0
> Labels:(eg) 59         453
> Each IPv6 SVI consumes one ACL-TCAM label. According to cisco docs PFC3B
> has 4096 such labels but there are only 512 in the output of 'sh tcam
> counts ipv6'.

I'm not sure this is right. We have pfc3b boxes with loads of 
IPv6-enabled SVIs and we're only using 16 ingress / 4 egress labels.

Do you have a different ACL per SVI? Can you show the config for one of 
the SVIs?

> #show platform software ipv6-multicast capability | include entries
>   Directly-connected entries for IPv6 is supported using ACL-TCAM.

I'm not sure how we suddenly get onto multicast? What makes you think 
this is related?

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