180CHAPTER 9: CONFIGURATION COMMANDS FOR ETHERNET INTERFACES IN BRIDGE MODE

loopback-detection enable

Syntax loopback-detection enable

undo loopback-detection enable

View System view/Ethernet interface view

Parameter None

Description Use the loopback-detection enable command to enable loopback detection globally or on a specified port.

Use the undo loopback-detection enable command to disable loopback detection globally or on a specified port.

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

If an Access port has been detected with loopback, it will be shutdown. A Trap message will be sent to the terminal and the corresponding MAC address If a Trunk port or Hybrid port has been detected with loopback, a Trunk message will be sent to the terminal. They will be shutdown if the loopback testing function is enabled on them. In addition, a Trap message will be sent to the terminal and the corresponding MAC address forwarding entries will be deleted.

Related command: loopback-detection control enable.

c CAUTION:

Loopback detection on a given port is enabled only after the loopback-detection enable command has been issued in both system view and the interface view of the port.

Loopback detection on all ports will be disabled after the issuing of the undo loopback-detection enable command under system view.

Example # Enable loopback detection on the interface Ethernet 1/0.

<Sysname> system-view

[Sysname] loopback-detection enable

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] loopback-detection enable

loopback-detection interval-time

Syntax loopback-detection interval-time time

undo loopback-detection interval-time

View System view

Page 180
Image 180
3Com MSR 30, MSR 50 Loopback-detection enable, Loopback-detection interval-time, View System view/Ethernet interface view