Users Guide

………………
………………
SFP 1 Diagnostic Information
===================================
SFP 1 Rx Power measurement type = OMA
===================================
SFP 1 Temp High Alarm threshold = 0.000C
SFP 1 Voltage High Alarm threshold = 0.000V
SFP 1 Bias High Alarm threshold = 0.000mA
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
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
no shutdown
To view dampening information on all or specific dampened interfaces, use the show interfaces dampening command from EXEC
Privilege mode.
Dell#show interfaces dampening
Interface Supp Flaps Penalty Half-Life Reuse Suppress Max-Sup
State
Te 1/1 Up 0 0 1 2 3 4
Te 1/2 Up 0 0 1 2 3 4
Te 1/2 Up 0 0 1 2 3 4
Dell#
348
Interfaces