Multi-homed clients and BGP timers

Sat May 23 12:46:51 UTC 2009

> If you want to converge a little fast than BGP holdtimes here 
> and the fiber link is directly between the routers, you might 
> look at something akin to Cisco's "bgp 
> fast-external-fallover", which immediately resets the session 
> if the link layer is reset or lost.

For fast external fallover, your physical interface has to go down. Inside
your network you could use BGP fast fallover (which drops BGP session after
the IGP route to the neighbor is lost), details are here:

http://www.nil.com/ipcorner/DesigningBGPNetworks/

Fast fallover with EBGP multihop is described here:

http://wiki.nil.com/EBGP_load_balancing_with_EBGP_session_between_loopback_i
nterfaces

Ivan

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