Dear Steve,
But thats very strange way of hashing since the bulk of for instance
enterprise traffic is probably on port 80 and would take the same path. Its
ok as long it is the same session that take the same path but you would like
to load balance the traffic for the same TCP port but for different src IP
adresses over your composite links.
In the report you refer to their conclusion was that the CRC 16 on the five
tuple (src IP, dst, IP src port, dst port, prot id) shows the best load
balancing distribution performance.
In this case it could be a 20-bit CRC on the fivetuple that builds up the
flow label.
-- thomas
>-----Original Message-----
>From: Steve Blake [mailto:[EMAIL PROTECTED]]
>Sent: den 23 augusti 2001 16:55
>To: Thomas Eklund
>Cc: ipng
>Subject: Re: Higher level question about flow label
>
>
>Thomas Eklund wrote:
>
>
>> I also saw Steve Blakes comment that is not recommended to
>use TCP/UDP ports
>> in the hash key for ECMP but the one of the biggest problem with the
>> bundling is to send one TCP flow over different path since
>it might end up
>> in packet re-ordering due the different delays etc and
>trigger TCP slow
>> start. To me it makes a lot of sense then to include the
>TCP/UDP ports when
>> you have your "hash key" since you would like that the same
>TCP flow take
>> the same path to not experience these problems.
>
>If you only hash on <srcaddr, dstaddr>, then all of the flows
>between the
>two end-points will follow the same path.
>
>There is a good paper by Cao, Wang, and Zegura analyzing the
>performance
>of various hashing schemes at
>http://www.ieee->infocom.org/2000/papers/650.ps.
>
>
>Regards,
>
>
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Steven L. Blake <[EMAIL PROTECTED]>
>Ericsson IP Infrastructure 919-472-9913
>
>
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