[c-nsp] EC flow hash computation w/MPLS

[Tim Stevenson]

At 06:46 PM 1/15/2008 +0100, Peter Rathlev observed:
>Hello,
>
>This may be a stupid question, but I was wondering how Etherchannel hash
>calculations treat MPLS traffic: Do they dive into the packet and
>calculate hashes based on encapsulated traffic, or is it based on the
>labels?

For MPLS frames with 3 or fewer labels in the stack we look at the IP 
header to make the hash decision. Otherwise, we look at the bottom 
two labels up to the 5th.


>The context is that I'm trying to find out how the WS-X6704-10GE
>compares to using Etherchannels on e.g. a WS-X6748-SFP.

The EC decision criteria is identical on these two linecards.

Tim


>  We're talking
>4-5 gigs peak, maybe a gig baseline, and this number only goes up of
>course.
>
>Thanks,
>Peter
>
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Data Center BU
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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