Dell S4048T, Configuration Manual

Page: 482 / 1277

Dell#show interfaces tengigabitethernet 1/4 transceiver
SFP 1 Serial ID Base Fields
SFP 1 Id = 0x0d
SFP 1 Ext Id = 0x00
SFP 1 Connector = 0x23
SFP 1 Transceiver Code = 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00
SFP 1 Encoding = 0x00
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SFP 1 Diagnostic Information
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SFP 1 Rx Power measurement type = OMA
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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.
Interfaces 482