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Re: URPF on small BGP-enabled customers?
- From: Pete Templin
- Date: Fri Jun 03 10:14:31 2005
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.
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 downside of
living in fear of my outbound traffic being dropped if I ever need to withdraw any
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.