Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 535

wavelength 1529.0 The wavelength range is from 1528.3 nm to 1568.77nm. • Verify configuration changes. INTERFACE mode show config 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 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, 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. 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 Interfaces 535