[c-nsp] uRPF Core Internet Routers

Antonio Soares amsoares at netcabo.pt
Tue Apr 16 13:37:26 EDT 2013

Hello group,

I looking for Information about anti-spoofing measures namely uRPF.

My initial reference is a quite old document:


It's funny to see this on the document:

"General questions on uRPF can be sent to unicast-rpf at cisco.com or
cisco-nsp at puck.nether.net."

So I must be on the right list :)

Now my question, is it appropriate to use uRPF loose mode on Core Routers
(Full Routing Tables) ?

How about the impact/restrictions ? I was able to find a few restrictions
when comparing the SUP720 with the SUP-2T but I'm more interested on IOS-XR



Antonio Soares, CCIE #18473 (R&S/SP)
amsoares at netcabo.pt

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