D-Link DGS-3426P Product Manual - Page 224

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch port. RPL Owner Enable or disable the RPL owner. Enabled specifies the device as an RPL owner node. Disabled indicates the node is not an RPL owner. By default, the RPL owner is disabled. Protected VLAN Action This 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. Toggle between Add or Delete. Add - This adds VLANs to the protected VLAN group. Delete - This removes VLANs from the protected VLAN group. Protected VIDList Tick this check box and enter the VLANs to be added or deleted. Ring MEL (0-7) Enter the ring MEL of the R-APS function. The range is from 0 to 7. The default ring MEL is 1. Holdoff Time (010000) 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. The range is from 0 to 10000 milliseconds. The default holdoff time is 0 milliseconds. Guard Time (102000) The Guard timer is used to prevent ring nodes from receiving outdated R-APS messages.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 RAPS 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. The range is from 10 to 2000 milliseconds. The default guard time is 500 milliseconds. WTR Time (5-12) The 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. The range is from 5 to 12 minutes. The default WTR time is 5 minutes. Click Apply to implement changes made. To edit ERPS RAPS Sub Ring Settings for an ERPS RAPS VLAN Table entry, click the Modify button in the Sub Ring Modify column in the ERPS RAPS VLAN Table. The following window will open: 215