You can also very easily modify these basic timer on per neighbor basis (or neighbor group basis) with command “ neighbor X.X.X.X timers keepalive holddown ” Example below sets the keepalive to 20 seconds and holddown to 60 seconds on R1. Last read 00:00:16, last write 00:00:16, hold time is 180, keepalive interval is 60 seconds
R1#show ip bgp neighborsīGP neighbor is 5.100.1.2, remote AS 64513, external linkīGP version 4, remote router ID 5.100.1.2 To verify current timers negotiated to a neighbor, issue the “show ip bgp neighbor” command, example below. As you might imagine, failing to receive three keepalives in a row will make the hold-down timer reach 180 seconds what will mean the neighbor is considered down and routes from this neighbor are flushed. Every keepalive message it reachieved from the neighbor peer resets this timer back to 0 seconds. Once the peering between two peers is UP, router starts a hold-down timer counting from 0 second up. By default, keepalive timer is 60 seconds and hold-down timer is 3xkeepalive or 180seconds. BGP “Minimum Hold-Down from Neighbor” optionįirst basic BGP times are Keepalive and Hold-down timer intervals.
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