BGP Flap

[RadioX]

We get a BGP flap every once in a blue moon but it still knocks customers down for that short period of time. It is so fast the routes really dont have time to change and repropogate.

Is there a command I can put in a router to lessen the blow so to speak on some of these flaps.

Thanks

 

[KiscoKid]

You can entertain putting in a gateway of last report on the customer router that faces the Internet. On the router that faces the customer network, you can try a floating static route for their networks.

e.g. On customer side: ip route 0.0.0.0 0.0.0.0 x.x.x.x

where x.x.x.x is the BGP peer

On ISP side: ip route 212.55.33.0 255.255.255.0 y.y.y.y 200

where y.y.y.y is the customer router

This works well for a single customer router. For dual routers, you can probably use two static routes equally weighted (with an AD of 200 as above) to force some kind of load-balancing.