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Description Use the group-membercommand to add specified Ethernet interfaces to a manual port group.

Use the undo group-membercommand to remove specified Ethernet interfaces from a manual port group.

By default, a manual port group contains no Ethernet interface.

Examples # Add interface Ethernet 1/0 to the manual port group named group 1.

<Sysname> system-view

[Sysname] port-group manual group1

[Sysname-port-group-manual-group1] group-member ethernet 1/0

loopback-detection control enable

Syntax loopback-detection control enable

undo loopback-detection control enable

View Ethernet interface view

Parameter None

Description Use the loopback-detection control enable command to enable loopback detection for a Trunk port or Hybrid port.

Use the undo loopback-detection control enable command to restore the default.

By default, loopback detection for a Trunk port or Hybrid port is disabled.

When the loopback detection is enabled, if a port has been detected with loopback, it will be shutdown. A Trap message will be sent to the terminal and the corresponding MAC address forwarding entries will be deleted.

When the loopback detection is disabled, if a port has been detected with loopback, a Trap message will be sent to the terminal. The port is still working properly.

By default, loopback detection for Trunk port and Hybrid port is disabled.

Note that this command is inapplicable to an Access port as its loopback detection is enabled by default.

Example # Enable loopback detection for the Trunk port Ethernet 1/0.

<Sysname> system-view

[Sysname] loopback-detection enable

[Sysname] interface ethernet 1/0 [Sysname-Ethernet1/0] port link-type trunk

[Sysname-Ethernet1/0] loopback-detection enable

[Sysname-Ethernet1/0] loopback-detection control enable

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3Com MSR 50, MSR 30 manual Loopback-detection control enable, 179