The MPLS WG Archive

[George Swallow <swallow@cisco.com>]

Shahram -

> >>1) ECMP could use only label hashing and not hash IP header.
> >
> >         This is unrealistic. Lots of vendors hash on both,
> >one or the other.  Lets not go down the road of trying
> >to mandate how ECMP works again. We went down that
> >road in MPLS and the response was clear.
> 
> Hashing on IP header is not part of any IETF standard, and I am not
> sure all future IETF standards should be based on supporting
> non-standard proprietary implementations. if one likes to still hash
> IP header, then he could define a proper protocol mux header and use
> it all the time.

There is a long history of standards bodies respecting equipment that
has already been fielded.  In this case we are talking about 100s of
thousands of units.   It was the IETF that chose to define the MPLS
encapsulation without a PID.  That's water under the bridge.  Now we
have to deal with it.

...George

==================================================================
George Swallow       Cisco Systems                  (978) 497-8143
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                     Chelmsford, Ma 01824