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How do I clear BGP dampening?
To clear Border Gateway Protocol (BGP) route flap dampening information, use the clear ip bgp dampening command.
What is BGP dampening?
Route Dampening is a way to suppress flapping routes so that they are “suppressed” instead of being advertised. An unstable network can cause BGP routes to flap, which can cause other BGP routers in the network to constantly reconverge. This wastes valuable CPU cycles and can cause severe problems in the network.
What causes BGP resets?
Changing configuration statements that affect BGP peers, such as renaming a BGP group, resets the BGP sessions. If you change the address family specified in the [edit protocols bgp family] hierarchy level, all current BGP sessions on the routing device are dropped and then reestablished.
What is the purpose of BGP route dampening?
BGP route dampening can be used to reduce the propagation of unstable routes throughout a network. When a prefix flaps it will be assigned a penalty of 1000 and moved into the dampening state “history”. Each flap incurs another penalty (of 1000), which is applied cumulatively.
What is the penalty for BGP dampening on R1?
The Dampinfo shows the network flapped four times, and has now been dampened. The current penalty is 3018, and can be reused in 3minutes 20 seconds. Assume now, that this is a real life situation and an engineer has fixed what he believes caused the route to become unstable on R1.
Why does my BGP router keep flapping?
An unstable network can cause BGP routes to flap, which can cause other BGP routers in the network to constantly reconverge. This wastes valuable CPU cycles and can cause severe problems in the network.
Can you use flap damping on iBGP and eBGP?
There is an exception that rule. Starting in Junos OS Release 12.2, you can apply flap damping at the address family level. In a Junos OS Release 12.2 or later installation, when you apply flap damping at the address family level, it works for both IBGP and EBGP. By default, route flap damping is not enabled.