D-Link xStack DES-3528 Series Cli Reference Manual page 540

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch CLI Reference Guide
config erps raps_vlan timer
Purpose
This command is used to configure the protocol timers.
Syntax config erps raps_vlan <vlanid> timer {holdoff_time <millisecond 0-10000> | guard_time
<millisecond 10-2000 > | wtr_time <min 5-12>}(1)
Description Holdoff timer
The Holdoff timer is 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
Guard timer is used to prevent ring nodes from receiving outdated R-APS messages.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, except in the case where a burst of three R-
APS event messages that indicates the topology of a sub-ring has changed and the node
needs to flush FDB are received on the node. In this case the recovered link does not go into
a blocking state. 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 - Specifies the R-APS VLAN used.
<vlanid> - Enter the VLAN ID used here.
holdoff_time - (Optional) Specifies the holdoff time of the R-APS function. The default holdoff
time is 0 milliseconds.
<millisecond 0-10000> - Enter the hold off time value here. This value must be in the range of
0 to 10000 millseconds.
guard_time - (Optional) Specifies the guard time of the R-APS function. The default guard
time is 500 milliseconds.
<millisecond 0-10000> - Enter the guard time value here. This value must be in the range of
0 to 10000 millseconds.
wtr_time - (Optional) Specifies the WTR time of the R-APS function.
<min_5-12> - Enter the WTR time range value here. The range is from 5 to 12 minutes. The
default WTR time is 5 minutes.
Restrictions Only Administrator, Operator and Power User-level users can issue this command.
Example usage:
To configure the ERPS timers for a specific R-APS VLAN:
DES-3528:admin# config erps raps_vlan 4094 timer holdoff_time 100 guard_time 1000
wtr_time 10
Command: config erps raps_vlan 4094 timer holdoff_time 100 guard_time 1000 wtr_time 10
Success.
DES-3528:admin#
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