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Re: Split flows across Domains
From: Robert E.Seastrom <rs () seastrom com>
Date: Tue, 24 Jan 2006 13:20:13 -0500



Joe Abley <jabley () isc org> writes:

On 24-Jan-2006, at 13:09, Robert E.Seastrom wrote:

Joe Abley <jabley () isc org> writes:

If you can get two candidate routes for the same destination into the
FIB, then you'll get per-flow load balancing as long as CEF is
running, no?

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

Even if the hash is only calculated over source and destination IP
addresses, the end effect is still that packets associated with a
single flow still follow the same route where there is more than one
candidate route available.

And conversely, that different flows that ought to be load-balanced
aren't.  But we're splitting semantic hairs here...  ;-)

                                        ---rob



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