D-Link xStack Reference Manual page 486

xStack® DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch CLI Reference Guide
Holdoff timer - Hold-off timer is used to filter out intermittent link faults when link failure occurs.
This timer is used during the protection switching process when link failure occurs. When a ring
node detects a link's failure, it will start the hold off timer. It will report the link failure event (R-APS
BPDU with SF flag) after the link failure is confirmed within this period of time.
Guard timer - Guard timer is used to prevent ring nodes from receiving outdated R-APS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 when link failure recovers.
When the link node detects that the link failure is recovered, 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. Therefore, the blocking state of the
recovered link will not be recovered within this period of time. This time 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. This timer 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.
Format
config erps raps_vlan <vlanid 1-4094> [state [enable | disable] | ring_mel <value 0-7> |
ring_port [west [<port> | virtual_channel] | east [<port> | virtual_channel]] | rpl_port [west |
east | none] | rpl_owner [enable | disable] | protected_vlan [add | delete] vlanid <vidlist> |
sub_ring raps_vlan <vlanid 1-4094> tc_propagation state [enable | disable] | [add | delete]
sub_ring raps_vlan <vlanid 1-4094> | revertive [enable | disable] | timer {holdoff_time
<millisecond 0-10000> | guard_time <millisecond 10-2000> | wtr_time <min 5-12>}]
Parameters
<vlanid 1-4094> - The VLAN ID associated with the R-APS VLAN.
state - Specifies the ERPS R-APS VLAN state.
enable - Specifies that the ERPS R-APS VLAN state will be enabled.
disable - Specifies that the ERPS R-APS VLAN state will be disabled.
ring_mel - Specifies the ring MEL of the R-APS function. The default ring MEL is 1.
<value 0-7> - Enter a value between 0 and 7.
ring_port - Specifies a port participating in the ERPS ring.
west - Specifies the port as the west ring port.
<port> - Enter a port.
virtual_channel - Specifies the port as a west port on the virtual channel.
east - Specifies the port as the east ring port.
<port> - Enter a port.
virtual_channel - Specifies the port as an east port on the virtual channel.
rpl_port - By default, the node has no RPL port.
west - Specifies the west ring port as the RPL port.
east - Specifies the east ring port as the RPL port.
none - No RPL port on this node.
rpl_owner - By default, the RPS owner is disabled.
enable - Specifies the device as an RPL owner node.
disable - This node is not an RPL owner.
protected_vlan - Specifies VLANs that are protected by the ERPS function. The R-APS VLAN
cannot be the protected VLAN. The protected VLAN can be one that has already been
created, or it can be used for a VLAN that has not yet been created.
add - Add VLANs to the protected VLAN group
delete - Delete VLANs from the protected VLAN group.
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