[c-nsp] WCCP performance problem on a 7600

[Charles Glass]

On Fri, Apr 11, 2008 at 4:47 PM, Adrian Chadd <adrian at creative.net.au> wrote:
> On Fri, Apr 11, 2008, Charles Glass wrote:
>
>  > WCCP has been configured to use GRE forwarding and HASH assignment.
>
>  Bzzt!
>
>
>  > I understand that GRE forwarding with HASH assignment is not the
>  > preferred configuration for WCCP on a 7600 and that GRE is not
>  > supported in hardware.
>  >
>  > Configuring L2 forwarding and HASH assignment yields no performance
>  > improvement from what I have seen.
>
>  Its probably being CPU punted!
>
>  > To make full use of hardware redirection the cache engines would need
>  > to be configured with L2 forwarding and mask assignment.
>
>  Well, why aren't you using mask assignment?
>
>
>  > Is anyone using L2 forwarding with MASK assignment?
>
>  Everyone I've spoken to doing WCCPv2 on the 6500/7600 ends up with
>  crap performance when not using L2/Mask, or great performance when
>  using L2/Mask.
>

Thank you for your reply.

Currently I cannot get caches in the service group to use mask
assignment without the service group becoming unstable. The mask
values are assigned according to the router but two minutes later
caches start dropping out of the service group.