A proper update message timer can be configured to suppress frequent route changes, improving BGP network stability.
BGP peers use update messages to exchange routing information. Update messages can be used to advertise multiple reachable routes with the same attributes or withdraw multiple unreachable routes.
BGP does not periodically update a routing table. When BGP routes change, BGP updates the changed BGP routes in the BGP routing table by sending Update messages. If a route changes frequently, to prevent the router from sending Update messages upon every change, set the interval at which Update messages are sent.
bgp { as-number-plain | as-number-dot }
peer { ipv4-address | group-name } route-update-interval interval
By default, the interval at which Update messages are sent to IBGP peers is 15s, and the interval at which Update messages are sent to EBGP peers is 30s.
ipv4-address specifies the address of a specific group. group-name specifies the name of a peer group. The Update messages Timer configured for a peer takes precedence over the Update messages Timer configured for a peer group.