A route flap occurs when a route is withdrawn and then later readvertised. This usually happens when an interface is going from the UP state to the DOWN state repeatedly. You can view the number of times a route has flapped using the show ip bgp flap-statistics command. This assumes that BGPP dampening has been enabled on the router.
rtrA# show ip bgp flap-statistics
BGP table version is 9, local router ID is 10.1.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Plv-irr-in noHao . -i _ TnD ca _ T?r!D O _ i npAmnl ofo
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