I have one upstream provider, and that upstream provider is connected to internet with two routers (and also two ISP's). When one of that upstream ISP routers is down I lose connectivity for 4 minutes to internet. What is convergence time for BGP?(what is the time that new routes is active on my router after one of upstreams router is down).4 minutes seems to much.
Cisco default keepalive and hold timers is 60 and 180 seconds. Usually the provider is not going to advice from the customer, but it looks like they might have to adjust their upstream sessions BGP timers.
The "180 seconds" give you three minutes. Then there's the delay before the router sends out the updates (neighbor advertisement-interval, up to 30 seconds by default on EBGP, 5 seconds on IBGP) and before the incoming BGP updates are considered for inclusion in the IP routing table.
But, as said before, these timers have to be tweaked by your ISP, there's nothing you can do.
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