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Device link detection protocol (DLDP)
[NOTE: ]

NOTE: DLDP is active on the following HP switches:

HP 3800 Switches
HP 2530 Switches
HP 2620 Switches
HP 2920 Switches
HP 3800 Switches
HP 5400R Switches (both v2 and v3 blades)


Device link detection protocol (DLDP) is switch technology that detects any unidirectional link failures that can occur in a network. Typically these unidirectional link failures occur among devices connected through fiber-optic or copper twisted pair (such as category 5 twisted pair) cables. Upon detecting a link failure, the link PHY will be kept UP and will be blocked in the hardware. All the upper layer protocols of the switch software (STP, LACP, etc.) will see the interface as DOWN.
[NOTE: ]

NOTE: DLDPDUs are sent as untagged PKTs on default VLAN. No support for tagged advertisements.

Link

Link
[NOTE: ]

NOTE: DLDP can be enabled on a maximum of 128 ports with each DLDP enabled port can have up to 4 neighbors (with the exception of the HP switch 2530.

On the HP Switch 2530, DLDP can be enables on a maximum of 12 ports with each DLDP enabled port allowed up to 4 neighborhoods.

Broken link

Broken link

Enabling or disabling DLDP

Syntax

dldp enable|disable

[no]dldp enable

This command is used in the configure mode to enable or disable DLDP on the switch.

The no form of command dldp in the configure context will disable the DLDP feature globally.

Enable or disable the Device Link Detection Protocol (DLDP) to monitor link status. DLDP must be enabled globally and on one or more interfaces to begin monitoring. DLDP is disabled by default.

dldp

Enable or disable the Device Link Detection Protocol (DLDP) to monitor link status.

enable

Enable DLDP.

disable

Disable DLDP.

Syntax

eth-1# dldp enable|disable

eth-1# dldp [no]dldp enable

This command is used in the specific interface to enable or disable DLDP on the switch.

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