The efm loopback ignore-request command enables an interface to ignore loopback requests sent by remote interfaces.
The undo efm loopback ignore-request command restores the default setting for the loopback function on an interface.
By default, an interface supports remote loopback. If an interface receives a loopback request sent by a remote interface, the interface enters the loopback state.
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Usage Scenario
Remote loopback is used to monitor link quality and locate link faults. Periodic loopback detection helps detect network faults promptly.
If an interface is in the loopback state, the interface loops back all received traffic, causing traffic interruptions and imposing attacks. To prevent the preceding problems, the efm loopback ignore-request command can be used to enable the interface to reject a remote Ethernet OAM loopback request carried in a loopback control OAM PDU sent by a remote interface.Prerequisites
EFM has been enabled on an interface using efm enable, and the interface is not in the loopback state.
Configuration Impact
After the efm loopback ignore-request command is run on an interface, the interface will discard an OAM PDU carrying a remote loopback request.
<HUAWEI> system-view [~HUAWEI] efm enable [*HUAWEI] interface GigabitEthernet 0/1/0 [*HUAWEI-GigabitEthernet0/1/0] efm enable [*HUAWEI-GigabitEthernet0/1/0] commit [~HUAWEI-GigabitEthernet0/1/0] efm loopback ignore-request