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xStack® DES-3200 Series Layer 2 Ethernet Managed Switch CLI Reference Guide
483
config erps timer
Purpose
Used to configure ERPS timers for an R-APS VLAN.
Syntax
<vlanid> timer { holdoff_time <millisecond 0-10000> | guard_time <millisecond 10-
2000 > | wtr_time <min 5-12>} (1)
Description
This command is used to configure the ERPS protocol timers on a specified R-APS
VLAN. The timers are defined as follows:
Holdoff timer - Used to filter out intermittent link faults when link failures occur during
the protection switching process. When a ring node detects a link failure, it will start
the holdoff timer and report the link failure event (R-APS BPDU with SF flag) after the
link failure is confirmed within period of time specified.
Guard timer - Used to prevent ring nodes from receiving outdated R-APS messages.
This timer is used during the protection switching process after the link failure
recovers. When the link node detects the recovery of the link, it will report the link
failure recovery event (R-APS PDU with NR flag) and start the guard timer. Before
the guard timer expires, all received R-APS messages are ignored by this ring node.
The Guard Timer should be greater than the maximum expected forwarding delay for
which one R-APS message circles around the ring.
WTR timer - WTR timer is used to prevent frequent operation of the protection switch
due to an intermittent defect. This timer is used during the protection switching
process when a link failure recovers. It is only used by the RPL owner. When the
RPL owner in protection state receives R-APS PDU with an NR flag, it will start the
WTR timer. The RPL owner will block the original unblocked RPL port and start to
send R-APS PDU with an RB flag after the link recovery is confirmed within this
period of time.
Parameters
raps_vlan <vlanid> - Designates the VLAN identified by the vlanid as the R-APS
VLAN where the timers are applied
holdoff_time < millisecond 0-10000> - Specifies the holdoff time of the R-APS
function. The default holdoff time is 0 milliseconds.
guard_time < millisecond 10-2000> - Specifies the guard time of the R-APS function.
The default guard time is 500 milliseconds.
wtr_time <min 5-12> - Specifies the WTR time of the R-APS function. The range is
from 5 to 12 minutes. The default WTR time is 5 minutes.
Restrictions
Only Administrator-level users can issue this command.
Example usage:
To configure ERPS timers on R-APS VLAN 4094:
DES-3200-28F:4# config erps raps_vlan 4094 holdoff_time 100 guard_time 1000 wtr_time 10
Command: config erps raps_vlan 4094 holdoff_time 100 guard_time 1000 wtr_time 10
Success.
DES-3200-28F:4#
config erps log
Purpose
Used to configure the status of the ERPS log function.