Configuration Guide User guide

FastIron Configuration Guide 687
53-1002494-02
UDLD overview
To enable UDLD on a port, enter a command such as the following at the global CONFIG level of the
CLI.
Brocade(config)#link-keepalive ethernet 0/1/1
To enable the feature on a trunk group, enter commands such as the following.
Brocade(config)#link-keepalive ethernet 0/1/1 ethernet 0/1/2
Brocade(config)#link-keepalive ethernet 0/1/3 ethernet 0/1/4
Syntax: [no] link-keepalive ethernet <port> [to <port> | ethernet <port>]
This command is not supported if you downgrade the device to FCX 6.0 or FSX5.1. In this case, use
the following command to configure multiple ports:
Syntax: [no] link-keepalive ethernet <port> [ethernet <port>]
Specify the port variable in one of the following formats:
• FWS, FCX, and ICX stackable switches – stack-unit/slotnum/portnum
• FSX 800 and FSX 1600 chassis devices – slotnum/portnum
• ICX devices – slotnum/portnum
• FESX compact switches – portnum
Enabling UDLD for tagged ports
To enable ports to receive and send UDLD control packets tagged with a specific VLAN ID, enter
commands such as the following.
Brocade(config)#link-keepalive ethernet 1/18 vlan 22
This command enables UDLD on port 1/18 and allows UDLD control packet tagged with VLAN 22
to be received and sent on port 1/18.
Syntax: [no] link-keepalive ethernet <port> [vlan <vlan-ID>]
Specify the port variable in one of the following formats:
• FWS, FCX, and ICX stackable switches – stack-unit/slotnum/portnum
• FSX 800 and FSX 1600 chassis devices – slotnum/portnum
• ICX devices – slotnum/portnum
• FESX compact switches – portnum
For the <vlan-ID> variable, enter the ID of the VLAN that the UDLD control packets can contain to
be received and sent on the port. If a VLAN ID is not specified, then UDLD control packets are sent
out of the port as untagged packets.
NOTE
You must configure the same VLANs that will be used for UDLD on all devices across the network;
otherwise, the UDLD link cannot be maintained.