loopback-detect enable (interface view)

Function

The loopback-detect enable command enables loopback detection on an interface.

The undo loopback-detect enable command disables loopback detection on an interface.

By default, loopback detection is disabled on an interface.

Format

loopback-detect enable

undo loopback-detect enable

Parameters

None

Views

Ethernet interface view, GE interface view, XGE interface view, 40GE interface view, MultiGE interface view, 100GE interface view, 25GE interface view, port group view, Eth-Trunk interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenarios

The loopback-detect enable command enables loopback detection on an interface. This function enables the system to detect a loopback on the downstream network quickly and shut down an interface to minimize the impact of the loopback on the entire network.

Precautions

After loopback detection is enabled on an interface, the interface sends loopback detection packets at intervals.

A large number of broadcast packets are sent during loopback detection, occupying CPU resources; therefore, disable loopback detection if it is not required.

On the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S, manual LBDT can be configured on a maximum of 64 Eth-Trunks; on other models, manual LBDT can be configured on a maximum of 32 Eth-Trunks.

Example

# Enable loopback detection for the GE0/0/1 interface.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] loopback-detect enable