D-Link xStack DGS-3420 Series Reference Manual page 405

xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch CLI Reference Guide
Note that modifying the RPL port and RPL owner may not take effect immediately when the ERPS
function is enabled. The ring will run the old configuration's protocol if the following conditions are not
met:
1. The RPL port is specified if the RPL owner is enabled.
2. The RPL port is not virtual channel.
The protected_vlan command is used to configure the 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.
The timer commands are used to configure the protocol timers:
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Guard timer - Guard timer is used to prevent ring nodes from receiving outdated R-APS messages.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> [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> tc_propagation state [enable | disable] | [add |delete] sub_ring raps_vlan <vlanid> |
revertive [enable | disable] | timer {holdoff_time <millisecond 0-10000> | guard_time
<millisecond 10-2000> | wtr_time <min 5-12>}(1)]
Parameters
<vlanid> - 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.
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