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Re: URPF on small BGP-enabled customers?
- From: Joe Maimon
- Date: Fri Jun 03 16:51:45 2005
Pete Templin wrote:
This sounds like the better approach. Although this is still not
strictly what the customer want, because all peers of the same edge will
prefer the edges path.
[email protected] wrote:
This is new to me, but I haven't bought any new transit in the past 18
months -- is
this common practice on multihomed BGP customers now? I could force
things to work
by always advertising all my prefixes out to them with the obvious
living in fear of my outbound traffic being dropped if I ever need to
I (a network much, much smaller than Sprint) do uRPF on all ports, but
also inform BGP customers (nine-page handoff documentation) that they
are uRPFed. However, in conjunction with community support for
adjusting localpref, we set a sufficient weight on the announcement so
that the edge node sees the customer link as preferred even if the rest
of our network doesn't, and therefore the uRPF check passes.
I don't think advertising more-specifics through other connections would
actually work, as the Sprint edge router would still want to reach the
more-specifics through the Sprint network, rather than the customer
link. It's all a matter of what the FIB says.