loopback-detection multi-port-mode enable
Syntax
loopback-detection multi-port-mode enable
undo loopback-detection multi-port-mode enable
View
System view
Default level
2: System level
Description
Use loopback-detection multi-port-mode enable to enable multi-port loopback detection.
Use undo loopback-detection multi-port-mode enable to restore the default.
By default, multi-port loopback detection is disabled.
If a device receives a packet that it sent out, a loop has occurred. Depending on whether the receiving interface is the same as the sending interface, loops include the following categories:
Single-port loopback—Occurs when a switch receives a packet that it sent out and the receiving interface is the same as the sending interface.
Multi-port loopback—Occurs when a switch receives a packet that it sent out but the receiving interface may not be the same as the sending interface.
To enable multi-port loopback detection, configure the loopback-detection multi-port-mode enable and loopback-detection enable commands in system view, and the loopback-detection enable command in the view of the target interfaces.
Examples
# Enable multi-port loopback detection to monitor loops between Ethernet 1/0/1 and Ethernet 1/0/2.
<Sysname> system-view [Sysname] loopback-detection enable [Sysname] loopback-detection multi-port-mode enable [Sysname] interface ethernet 1/0/1 [Sysname-Ethernet1/0/1] loopback-detection enable [Sysname-Ethernet1/0/1] quit [Sysname] interface ethernet 1/0/2 [Sysname-Ethernet1/0/2] loopback-detection enable