Service Manual

Dell#show interfaces tengigabitethernet 1/4/1 transceiver
SFP 4/1 Serial ID Base Fields
SFP 4/1 Id = 0x0d
SFP 4/1 Ext Id = 0x00
SFP 4/1 Connector = 0x23
SFP 4/1 Transceiver Code = 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00
SFP 4/1 Encoding = 0x00
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SFP 4/1 Diagnostic Information
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SFP 4/1 Rx Power measurement type = OMA
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SFP 4/1 Temp High Alarm threshold = 0.000C
SFP 4/1 Voltage High Alarm threshold = 0.000V
SFP 4/1 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 aps, routing protocols are notied of the status of the routes that are aected 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 apping by imposing a penalty for each interface ap 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 apping.
• improves network stability by penalizing misbehaving interfaces and redirecting trac.
• 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 congured for port monitoring.
• You can apply link dampening to Layer 2 and Layer 3 interfaces.
• You can congure 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
Examples of the show interfaces dampening Commands
To view the link dampening conguration on an interface, use the show config command.
R1(conf-if-te-1/1/1)#show config
!
interface TenGigabitEthernet 1/1/1
ip address 10.10.19.1/24
dampening 1 2 3 4
no shutdown
Interfaces
347