Command Reference ERPS Commands
no timer { holdoff-time | guard-time | wtr-time }
Value of the Holdoff timer in 100 milliseconds, the valid range is 0 to
100.
Value of the Guard timer in 10 milliseconds, the valid range is 1 to
200.
Value of the WTR in minute, the valid range is 5 to 12.
Holdoff timer: 0.
Guard timer: 500 milliseconds.
WTP timer: 5 seconds.
Holdoff timer: This timer is used to avoid the ERPS from topology swithcingswitching continuously
due to the link intermittent fault. With this timer configured, if the link fault is detected, the ERPS does
not perform the topology switching immediately until the timer times out and the link fault is verified.
Guard timer: This timer is used to prevent the device receiving the timed-out R-APS messages.
When the device detects the recovery from failure of the link, it sends out the message of link
recovery and starts up the Guard timer. Before the Guard times out, except for the flush packets
indicating the subring topology change, other packets are discarded directly without being handled.
WTR (Wait-to-restore) timer: This timer is only valid for the RPL owner device. It is mainly used to
prevent the RPL owner making the erroneous judgment to the ring network status. When the RPL
detects the fault recovery, it does not perform the topology switching immediately until the WTR times
out and the Ethernet ring indeed recovers from the fault. If the ring network fault is checked again
before the WTR times out, then the WTR timer will be canceled and topology switching will be not
executed any longer.
The following example configures the timer of the ERPS protocol.
# Enter the privileged EXEC mode.
Ruijie# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
# Enter the ERPS configuration mode.
Ruijie(config)# erps raps-vlan 4093
# Configure the protocol timer.
Ruijie(config-erps4093)# timer holdoff-time 10
Ruijie(config-erps4093)# timer guard-time 10
Ruijie(config-erps4093)# timer wtr-time 10
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