Re: [PCN] RSVP and ECMP

I'm not sure what's done in reality (if at all), but RSVP PATH messages
have the 'router alert' flag set, so in theory they are processed
differently from a regular IP packet anyway.

Greetings,
Martin

Michael Menth wrote:
> Hi,
> 
> I've got a question regarding RSVP. PATH messages need to be carried
> over the same path as subsequent data packets. How is this achieved in
> the presence of ECMP routing? In theory, PATH messages can take a
> different route than data packets if the load balancer takes arbitrary
> parts of the header(s) to calculate a suitable hash value, which decides
> which route the packet will take.
> 
> This issue seems to be related to the problem of how to make sure that
> PCN probe messages take the same path as subsequent PCN data packets,
> provided that they have the same source and destination ports and
> addresses.
> 
> I am interested in how this problem is solved in practice or whether it
> is intentionally avoided.
> 
> Regards,
> 
>    Michael
> 

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