On a dual-homing TRILL network where M-LAG is deployed, when the peer-link fails but the heartbeat status is normal, the M-LAG interface on the backup device enters the Error-Down state. On a dual-homing Ethernet, VXLAN, or IP network where M-LAG is deployed, when the peer-link fails but the heartbeat status is normal, interfaces except the management interface, peer-link interface, and stack interface on the backup device all enter the Error-Down state. When the peer-link recovers, the M-LAG interface in Error-Down state becomes Up after 2 minutes by default, and the physical interfaces in Error-Down state are restored to be Up. In an SVF of fixed and modular switches, the physical interfaces in Error-Down state on a leaf switch are restored after 5 minutes by default.

# Configure Eth-Trunk 2 on the backup device to enter the Error-Down state.

<HUAWEI> system-view
[~HUAWEI] interface eth-trunk 2
[*HUAWEI-Eth-Trunk2] m-lag unpaired-port suspend
[*HUAWEI-Eth-Trunk2] commit

• When the peer-link fails but the heartbeat status is normal, only the interface where the m-lag unpaired-port suspend command is configured enters the Error-Down state in addition to the M-LAG interface in Error-Down state.
• The m-lag unpaired-port suspend command cannot be configured on the M-LAG interface. It is recommended that this command be configured on both the M-LAG master and backup devices.