North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: URPF on small BGP-enabled customers?
[email protected] wrote: 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 of them. 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. pt
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