the interface becomes stable and the penalty decays below a certain threshold, the interface comes up
again and the routing protocols re-converge.
Link dampening:
• reduces processing on the CPUs by reducing excessive interface flapping.
• improves network stability by penalizing misbehaving interfaces and redirecting traffic.
• improves convergence times and stability throughout the network by isolating failures so that
disturbances are not propagated.
Important Points to Remember
• Link dampening is not supported on VLAN interfaces.
• Link dampening is disabled when the interface is configured for port monitoring.
• You can apply link dampening to Layer 2 and Layer 3 interfaces.
• You can configure link dampening on individual interfaces in a LAG.
Enabling Link Dampening
To enable link dampening, use the following command.
• Enable link dampening.
INTERFACE mode
dampening
Examples of the show interfaces dampening Commands
R1(conf-if-te-1/1)#show config
!
interface TengigabitEthernet 1/1
ip address 10.10.19.1/24
dampening 1 2 3 4
no shutdown
R1(conf-if-te-1/1)#exit
To view the link dampening configuration on an interface, use the show config command.
To view dampening information on all or specific dampened interfaces, use the show interfaces
dampening command from EXEC Privilege mode.
Dell# show interfaces dampening
InterfaceStateFlapsPenaltyHalf-LifeReuseSuppressMax-Sup
Te 0/0Up005750250020
Te 0/1Up21200205001500300
Te 0/2Down4850306002000120
To view a dampening summary for the entire system, use the show interfaces dampening summary
command from EXEC Privilege mode.
Dell# show interfaces dampening summary
20 interfaces are configured with dampening. 3 interfaces are currently
suppressed.
Following interfaces are currently suppressed:
Te 0/2
Te 3/1
Te 4/2
Dell#
432 Interfaces