I'm currently planning on reconfiguring some eBGP sessions in our network from using loopbacks to being directly connected.
One of the main drivers for this is to take advantage of 'BGP Fast External Failover' so that the BGP session will be terminated without waiting for the hold timer to expire. We currently have timers set to 30 keepalive and 90 hold time. This causes a blackhole during link failure until the hold time is reached and routes learned via another neighbor can be chosen as best path.
Another bonus is that we get to remove OSPF from the neighboring routers which is currently used to advertise loopbacks.
In a nutshell, I was wondering why the default for BGP timers is 60 180 anyway? 3 minutes seems a long time to wait in this day and age!
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