Multi-homed clients and BGP timers

Frank Bulk frnkblk at
Sun May 24 08:53:56 CDT 2009

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.


-----Original Message-----
From: Ivan Pepelnjak [mailto:ip at] 
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)

A complete list is at the bottom of this document:

You'll find some more BFD details and usage guidelines here:

Best regards

> > 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] 

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