I would agree, BFD is the ideal way to go. I've wanted our upstream provider to use BFD on our OSPF and iBGP links, but they said they're still testing it internally. They're quite gun-shy on implementing it because the existing configuration is stable -- they don't want a new protocol creating unnecessary failovers. I'm just looking to cut failovers from the existing 12 to 45 seconds (depending on the direction) to a second or two. Frank -----Original Message----- From: Ivan Pepelnjak [mailto:ip@ioshints.info] Sent: Saturday, May 23, 2009 7:40 AM To: 'Steve Bertrand'; 'Jack Bates' Cc: 'NANOG list' Subject: RE: Multi-homed clients and BGP timers For BFD to work, you need: * ISR + 12.4(15)T (or later) * 7200 with 12.4T or 12.2SRx * 7600/6500/GSR + 12.2SRB (or later) * ASR A complete list is at the bottom of this document: http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fs_bfd.html You'll find some more BFD details and usage guidelines here: http://www.nil.com/ipcorner/bfd/ Best regards Ivan http://www.ioshints.info/about http://blog.ioshints.info/
Correct me if I'm wrong, but wasn't this exactly the type of situation that BFD was designed to detect and help with?
I don't know, but I'm printing it[1] anyway to take home and read. It's been mentioned a few times, and clearly worth learning about.
Thanks,
Steve
[1] http://bgp.potaroo.net/ietf/all-ids/draft-ietf-bfd-v4v6-1hop-09.txt