Link Dampening; Important Points To Remember; Enabling Link Dampening - Dell S4820T Configuration Manual

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Link Dampening

Interface state changes occur when interfaces are administratively brought up or down or if an interface

state changes.

Every time an interface changes a state or flaps, routing protocols are notified of the status of the routes

that are affected by the change in state. These protocols go through the momentous task of re-

converging. Flapping; therefore, puts the status of entire network at risk of transient loops and black

Link dampening minimizes the risk created by flapping by imposing a penalty for each interface flap and

decaying the penalty exponentially. After the penalty exceeds a certain threshold, the interface is put in an

Error-Disabled state and for all practical purposes of routing, the interface is deemed to be "down." After

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.

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.

To enable link dampening, use the following command.

Enable link dampening.

INTERFACE mode

Examples of the show interfaces dampening Commands

To view the link dampening configuration on an interface, use the show config command.

R1(conf-if-te-1/1)#show config

interface TenGigabitEthernet 1/1

ip address 10.10.19.1/24

dampening 1 2 3 4

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