debug ethernet

This command configures loopback testing on specific WAN interfaces, for monitoring and troubleshooting (debugging).

Loopback debugging can be activated on any WAN interface (name or type) and allows the remote side to loop traffic back through the device's WAN interface (typically used to check traffic flow). This is to comply with the IEEE 802.3ah standard for Operation, Administration, and Management (OAM) for link-fault management by remote loopback (on the Ethernet WAN interface).

The no debug command is used to disable the feature.

Syntax

# debug ethernet loopback interface 

Command	Description
fiber [slot/port]	Configures the fiber interface in Loopback mode.
gigabitethernet [slot/port]	Configures the Gigabit Ethernet interface in Loopback mode.

Command Mode

Privileged User

Note

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The command is applicable only to Mediant 500 MSBR and Mediant 800/B MSBR.

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All communication through the loopback WAN interface stops when the command is enabled.

Example

This example shows how to use debug ethernet:

# debug ethernet loopback interface gigabitethernet 0/0
        Interface is in LOOPBACK mode.
        You will be unable to pass traffic across that interface.