nanog mailing list archives
Re: URPF on small BGP-enabled customers?
From: Pete Templin <petelists () templin org>
Date: Fri, 03 Jun 2005 09:13:26 -0500
will () loopfree net 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 downside of living in fear of my outbound traffic being dropped if I ever need to withdraw any of them.
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.
pt
Current thread:
- URPF on small BGP-enabled customers? will (Jun 03)
- Re: URPF on small BGP-enabled customers? Christopher L. Morrow (Jun 03)
- Re: URPF on small BGP-enabled customers? Pete Templin (Jun 03)
- Re: URPF on small BGP-enabled customers? Joe Maimon (Jun 03)
- Re: URPF on small BGP-enabled customers? Stephen Stuart (Jun 03)
- <Possible follow-ups>
- Re: URPF on small BGP-enabled customers? christian . macnevin (Jun 03)
- Re: URPF on small BGP-enabled customers? Andre Oppermann (Jun 03)
- Re: URPF on small BGP-enabled customers? Patrick W. Gilmore (Jun 03)
- Re: URPF on small BGP-enabled customers? Christopher L. Morrow (Jun 03)
- Re: URPF on small BGP-enabled customers? Patrick W. Gilmore (Jun 03)
- RE: URPF on small BGP-enabled customers? Olsen, Jason (Jun 03)
- Re: URPF on small BGP-enabled customers? christian . macnevin (Jun 03)
- Re: URPF on small BGP-enabled customers? Andre Oppermann (Jun 03)