Split flows across Domains

Wed Jan 25 16:15:26 UTC 2006

Robert E Seastrom writes:
> Yes and no.  CEF is {src, dst} hash IIRC, and "per-flow" usually
> means {src, srcport, dst, dstport, [proto, tos]} hash in my
> experience.

Correct.

The Catalyst 6500/7600 OSR with Sup2/Sup32/Sup720 can be configured to
hash based on L4 ports in addition to the IP addresses (for IPv4):

http://puck.nether.net/pipermail/cisco-nsp/2005-December/026952.html

This is handy when you have multiple "striped" TCP connections between
a single pair of hosts, and want them to be able to use multiple
equal-cost paths, but still want to avoid reordering inside each
connection (as you would inevitably get with per-packet load
sharing).
-- 
Simon.