Hey all,
I created this post to dig into BGP convergence time a bit, to hopefully get some more clarity. In our datacenters we have 2 routers that host an eBGP session to their own provider. Obviously the backup is set to heavily prepped our AS several more times than our primary.
In your experiences, how long would it roughly take to fail-over if a rat bit the primary connection in half and hard downed our primary session? I know the ISP's end would detect that and toss out our route immediately, but I know it would still take a bit to communicate that with upstream routers as well as other ISPs, due to the minimum advertisement interval of 30 second. From what I understand, BGP doesn't do triggered updates like other IGPs, rather it would wait 30 seconds to send any revised routes over to its other peers.
Any insight would be awesome!
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