Edge-Core ECS4660-28F Management Manual page 1310

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| ERPS Commands

holdoff-timer

This command sets the guard timer to prevent ring nodes from receiving

outdated R-APS messages. Use the no form to restore the default setting.

guard-timer milliseconds

milliseconds - The guard timer is used to prevent ring nodes from

receiving outdated R-APS messages. During the duration of the

guard timer, all received R-APS messages are ignored by the ring

protection control process, giving time for old messages still

circulating on the ring to expire. (Range: 10-2000 milliseconds, in

steps of 10 milliseconds)

500 milliseconds

ERPS Configuration

The guard timer duration should be greater than the maximum expected

forwarding delay for an R-APS message to pass around the ring. A side-

effect of the guard timer is that during its duration, a node will be unaware

of new or existing ring requests transmitted from other nodes.

Console(config-erps)#guard-timer 300

Console(config-erps)#

This command sets the timer to filter out intermittent link faults. Use the

no form to restore the default setting.

holdoff-timer milliseconds

milliseconds - The hold-off timer is used to filter out intermittent

link faults. Faults will only be reported to the ring protection

mechanism if this timer expires. (Range: 0-10000 milliseconds, in

steps of 100 milliseconds)

0 milliseconds

ERPS Configuration

In order to coordinate timing of protection switches at multiple layers, a

hold-off timer may be required. Its purpose is to allow, for example, a

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