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UniDirectional Link Detection Commands

CLI Command Reference

September 2014 Page 493

HP Moonshot Switch Module CLI Command Reference

show udld unit/slot/port

This command displays the UDLD settings for the specified unit/slot/port. If the all keyword is entered, it

displays information for all ports.

Example: The following shows example CLI display output for the command.

(Routing) #show udld 1/0/1

Port Admin Mode UDLD Mode UDLD Status

----- ---------- ----------- --------------

1/0/1 Enabled Normal Not Applicable

Format show udld {unit/slot/port | all}

Mode • User EXEC

•Privileged EXEC

Parameter Description

Port The port for which UDLD information is displayed.

Admin Mode The administrative mode of UDLD on the port.

UDLD Mode The UDLD mode for the port, which is one of the following:

• Normal – The state of the port is classified as Undetermined if an anomaly exists. An

anomaly might be the absence of its own information in received UDLD messages or the

failure to receive UDLD messages. An Undetermined state has no effect on the

operation of the port. The port is not disabled and continues operating. When

operating in UDLD normal mode, a port will be put into a disabled (Shutdown) state

only in the following situations:

– The UDLD PDU received from a partner does not have its own details (echo).

– When there is a loopback, and information sent out on a port is received back

exactly as it was sent.

• Aggressive – The port is put into a disabled state for the same reasons that it occurs in

normal mode. Additionally, a port in UDLD aggressive mode can be disabled if the port

does not receive any UDLD echo packets even after bidirectional connection was

established. If a bidirectional link is established, and packets suddenly stop coming from

partner device, the UDLD aggressive-mode port assumes that link has become

unidirectional.

UDLD Status The UDLD status on the port, which is one of the following:

• Not Applicable – The administrative status of UDLD is globally disabled or disabled on

the interface.

• Bidirectional – UDLD has detected a bidirectional link.

• Shutdown – UDLD has detected a unidirectional link, and the port is in a disabled state.

To clear the disabled state, click UDLD Port Reset.

• Undetermined – UDLD has not collected enough information to determine the state of

the port.

• Unknown – The port link has physically gone down, but it is not because it was put in a

disabled state by the UDLD feature

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