The efm loopback ignore-request command enables an interface to ignore loopback requests sent by the remote end.
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. After receiving a loopback request from a remote end, the interface enters the loopback state.
Ethernet interface view, GE interface view, XGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, MultiGE interface view, port group view
Usage Scenario
Remote loopback is used to monitor link quality and locate link faults. Periodic loopback detection helps detect network faults in a timely manner.
If an interface is in loopback state, the interface loops back all received traffic, causing service interruption and imposing attacks. To solve this problem, run the efm loopback ignore-request command to enable the interface to reject the remote Ethernet OAM loopback request carried in a Loopback Control OAMPDU sent by a remote interface.
Prerequisites
EFM has been enabled globally and on an interface using the efm enable command and the interface is not in loopback state.
Precautions
After the efm loopback ignore-request command is run, the interface will discard an OAMPDU carrying a remote loopback request.
# Enable Layer 2 interface GigabitEthernet0/0/1 to ignore loopback requests sent by a specified remote interface.
<HUAWEI> system-view [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] efm loopback ignore-request
# Enable Layer 3 interface GigabitEthernet0/0/1 to ignore loopback requests sent by a specified remote interface.
<HUAWEI> system-view [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] efm loopback ignore-request