[c-nsp] bgp transit, selecting providers based on source IP

[Michael K. Smith - Adhost]

> ...snip...snip...
> 
> >
> > The answer to this may be "no way".  :-)  If you have a peering
> session
> > with the customer, why not only announce your routes from your two
> other
> > providers so that the customer doesn't see the routes from the one
> they
> > want to avoid?  Wouldn't that accomplish the same thing?  You could
> tag
> > your transit routes with a community, add the two you want to transit
> to
> > a community-list and then announce only the routes that match the
> list.
> >
> > Thinking out loud, but not necessarily well.  :-)
> >
> 
> And when the packets reach his routers that have all 3 provider exit
> points
> available, how is he going to prevent those packets from choosing the
> "undesired" exit point?
> 
> It's not a question of what he advertises to his customer, but rather
> how
> the forwarding decision is modified for just this customer.
> 

Got it!  You can't adjust your upstream's FIB.  So MPLS or PBR.

Mike
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