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  • Frode Lillevold thinks this is interesting:

The delay for BGP to remove the prefixes because of next-hop resolution depends on when BGP Scanner runs. This could result in a maximum delay of 60 seconds


Cover of BGP Design and Implementation


Wrong! Newer IOS versions has BGP NHT enabled by default, with only a 5-second default delay slowing the convergence when a next-hop is lost for a BGP-learned route.