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