Saturday, July 11, 2020

What's a good "rule of thumb" for BGP convergence time across the internet?

Let's say I add, withdraw, or make a policy change to one of my prefixes. How long do you suppose it would take for the update to propagate across the internet? I've generally heard "a couple of minutes" but nothing more detailed than that. Also, does most of the delay come from the advertisement interval, or are there other factors that cause BGP to be quite slow to converge?



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