Configuring Route Dampening For Bgp - D-Link xStack DGS-3610 Series Configuration Manual

Chapter 29 BGP Configuration
In general, it is not necessary to establish the connection relationship between the clients of
the route reflector within the cluster, and the route reflector will reflect the route among
clients. However, if the full connection relationship is established for all clients, the function
for the route reflector to reflect the client route can be cancelled.
To cancel the function of reflecting the client route, execute the following operations in the
BGP configuration mode:
Command
Router(config-router)# no bgp
client-to-client reflection
29.13 Configuring Route Dampening for
BGP
The route changes between the validity and invalidity is referred to as the route flap. The
route flap usually causes the unstable route to be transmitted on Internet, which will result in
the instability of the network. The BGP route dampening is a measure to reduce the route
flap, which will reduce the possible route flap by monitoring the route information of EBGP
Peers.
The route dampening of BGP uses the following glossaries:
Route Flap, the route changes between validity and invalidity.

Penalty: For each route flap, enable the BGP Speakers of the route dampening to add

one penalty for this route, which will be accumulated to exceed the suppress limit.
Suppress Limit: When the penalty of the route exceeds this value, this route will be

suppressed.
Half-life-time: The time passed through when the penalty is reduced to half of its value.

Reuse Limit: When the penalty of the route is lower than this value, the route

suppression is released.
Max-suppress-time: The maximal time the route can be suppressed.

The brief description of the route dampening processing: For one route flap, the BGP
Speakers carry out one penalty for this route (Accumulated to the penalty). Once the penalty
value reaches the suppress limit, the route will be suppressed. When the half-life-time
reaches, the penalty value is reduced to half of its value. Once the penalty value is reduced
to the reuse limit, the route will be activated again. The maximal time the route is suppressed
is the maximal suppress time.
To configure the route dampening of the BGP, execute the following operations in the BGP
configuration mode:
Command
Router(config-router)# bgp dampening
29-20
DGS-3610 Series Configuration Guide
Meaning
(Optional) Cancel the route reflector among clients.
Meaning
Enable the Route dampening of the BGP.