Digisol DG-FS4528P, Management Manual

Page: 785 / 973

C
HAPTER
38 | ERPS Commands
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guard-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outdated R-APS messages.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.
S
YNTAX
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receiving outdated R-APS messages.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)
D
EFAULT
S
ETTING
500 milliseconds
C
OMMAND
M
ODE
ERPS Configuration
C
OMMAND
U
SAGE
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.
E
XAMPLE
Console(config-erps)#guard-timer 300
Console(config-erps)#
holdoff-timer
This command sets the timer to filter out intermittent link faults. Use the
no form to restore the default setting.
S
YNTAX
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)
D
EFAULT
S
ETTING
0 milliseconds
C
OMMAND
M
ODE
ERPS Configuration
C
OMMAND
U
SAGE
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