UDLD for Tagged Ports

The default implementation of UDLD sends the packets untagged, even across tagged ports. If the untagged UDLD packet is received by a third-party switch, that switch may reject the packet. As a result, UDLD may be limited only to RUCKUS devices, since UDLD may not function on third-party switches.

To solve this issue, you can configure ports to send out UDLD control packets that are tagged with a specific VLAN ID. This feature also enables third-party switches to receive the control packets that are tagged with the specified VLAN. For tagged operation, all of the following conditions must be met:

• A VLAN is specified when UDLD is configured
• The port belongs to the configured VLAN as tagged member
• All the devices across the UDLD link are in the same VLAN