[c-nsp] WCCPv2 Cisco 7600 + mask assignment problems

[Asbjorn Hojmark - Lists]

> - using L2 rewrite rather than GRE encap to the cache scales
>   more.
> - L2 + XOR traffic-distribution-hash uses MLS cache entries
>   for partial h/w acceleration (1st flow in s/w sets up MLS
>   entry) for intercepted flows.
> - L2 + "hash-mask" traffic-distribution means _all_ traffic
>   stays in h/w CEF path
> 
> the former will get you up to a few hundred Mbps, the latter 
> will scale to the maximum h/w forwarding of the platform.

Given that one doesn't configure GRE, how do you find out what
mode they're running? Do they (the router and the cache) somehow
'negotiate' that, or do you configure it on the router?

When using GRE encap, why is performance only 'a few hundred
Mbps'? On the Sup720, can't GRE be offloaded in hardware?

> what does your cache vendor support?  they should support all
> permutations & if you used the latter, it'll scale to the 
> limits of the h/w.

Does anyone other than Cisco support "hash mask"?

-A
PS: Do you know how this works on the 4500 platform?