• module module-number: enter the keyword module then the module number to specify the optional module in which the port ispresent.• number: enter the port number of the 100G port to be split. The range is from 1 to 8.• Split a 100G port into four 10G ports.CONFIGURATION Modestack-unit stack-unit-number module module-number port number portmode quad speed 10G• stack-unit-number: enter the stack member unit identifier of the stack member to reset.• module module-number: enter the keyword module then the module number to specify the optional module in which the port ispresent.• number: enter the port number of the 100G port to be split. The range is from 1 to 8.Link DampeningInterface 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 instate. These protocols go through the momentous task of re-converging. Flapping; therefore, puts the status of entire network at risk oftransient loops and black holes.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, theinterface is deemed to be “down.” After the interface becomes stable and the penalty decays below a certain threshold, the interfacecomes 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 DampeningTo enable link dampening, use the following command.• Enable link dampening.INTERFACE modedampeningExamples of the show interfaces dampening CommandsTo view the link dampening configuration on an interface, use the show config command.R1(conf-if-te-1/1/1/1/1)#show config!interface TenGigabitEthernet 1/1/1/1ip address 10.10.19.1/24398 Interfaces
