[c-nsp] ASIC to switch port mapping

[Gert Doering]

Hi,

On Mon, Sep 20, 2010 at 02:41:12PM +0000, Mishka, Jason wrote:
> I've seen similar problems when backups run at night.  The drops happened on a 4xGE etherchannel on the individual ports in the bundle.  What I found was that the hashing was being done very poorly and one of the interfaces was being assigned more than its share of the load.  I know there are different hash algorithms but none appear to be able to do anything different in this case.  

Well, in our case we hash on src+destination IP address, and since this
is audio streaming to a high number of destinations (10.000 different
IPs or more) it hashes very well.

If you do backups, you basically have "few source IPs, one destination IP"
and hashing will always be less than perfectly balanced.

gert 

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