something like this ("in cisco parlance" :-) should do the trick: router bgp 65534 bgp dampening route-map damp ! access-list 101 permit ip any 255.255.240.0 0.0.15.255 access-list 102 permit ip any any ! route-map damp permit 10 match ip address 101 set dampening 30 750 2000 90 ! route-map damp permit 20 match ip address 102 set dampening 15 750 2000 60 you can see the effects from the output below. in short, i've tightened the thresholds on prefixes longer than /19. lab2-7507#sh ip bgp fla BGP table version is 91081, local router ID is 207.240.2.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? - incomplete Network From Flaps Duration Reuse Path *d 215.1.0.0 207.240.2.2 4 00:02:35 00:58:30 65533 *d 215.1.0.0/20 207.240.2.2 4 00:02:35 00:58:30 65533 *d 215.1.0.0/16 207.240.2.2 4 00:02:35 00:28:40 65533 lab2-7507# we're currently not dampening based on prefix length yet, although we are experimenting with it. -danny

The 'discussion' of Jack's report seems to have overwhelmed an actual operational question. I am shocked and surprised.

In cisco parlance, such an entry might be

access-list 142 deny ip any 255.255.255.128 0.0.0.127

which blocks any prefix longer than a /24.

As to how to express the dampening in the report you mention, could someone who has it actually installed (come on RV, SD, ...) and debugged please post? I have exceeded my error quota for the day. Thanks.

randy