R0106-HP MSR Router Series Interface Command Reference(V7)

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Parameters
16: Sets the CRC length to 16 bits.
32: Sets the CRC length to 32 bits.
Usage guidelines
The CRC length must be the same at both ends.
Examples
# Set the CRC length to 16 bits on POS 2/2/0.
<Sysname> system-view
[Sysname] interface pos 2/2/0
[Sysname-Pos2/2/0] crc 16
dampening
Use dampening to enable the device to dampen an interface when it is flapping.
Use undo dampening to disable interface dampening.
Syntax
dampening [ half-life reuse suppress max-suppress-time ]
undo dampening
Default
Interface dampening is disabled on POS interfaces.
Views
Standard POS interface view
Predefined user roles
network-admin
Parameters
half-life: Specifies the amount of time (in seconds) for a penalty to decrease by half of its value. The
interface has an initial penalty of 0. When the interface flaps, it is assigned a penalty of 1000 for each
down event until the maximum penalty is reached. When the interface stops flapping, the penalty
decreases by half each time the half-life timer expires until the penalty drops to the reuse threshold. The
value range for the half-life timer is 1 to 120 seconds, and the default is 54 seconds.
reuse: Specifies the reuse threshold. When the accumulated penalty decreases to this threshold, the
interface is not dampened. Interface state changes are reported to the higher layers. The value range for
the reuse threshold is 200 to 20000, and the default is 750. The reuse threshold must be less than the
suppression threshold.
suppress: Specifies the suppression threshold. This threshold is the accumulated penalty that triggers the
device to dampen the interface. In dampened state, the interface does not report its state changes to the
higher layers. The value range for the suppression threshold is 200 to 20000, and the default is 2000.
max-suppress-time: Specifies the maximum amount of time the interface can be dampened. If the penalty
is still higher than the reuse threshold when this timer expires, the penalty stops increasing for down
events. The penalty starts to decrease until it drops below the reuse threshold. The value range for the
maximum suppression time is 1 to 255 seconds, and the default is 162 seconds (three times the half-life
timer).