Configuring Loopback Detection For An Ethernet Port - H3C S5100-SI Series Operation Manual

Operation Manual – Port Basic Configuration
H3C S5100-SI/EI Series Ethernet Switches

1.1.7 Configuring Loopback Detection for an Ethernet Port

Loopback detection is used to monitor if loopback occurs on a switch port.
After you enable loopback detection on Ethernet ports, the switch can monitor if
external loopback occurs on them. If there is a loopback port found, the switch will put it
under control.
If loopback is found on an access port, the system disables the port, sends a Trap
message to the client and removes the corresponding MAC forwarding entry.
If loopback is found on a trunk or hybrid port, the system sends a Trap message to
the client. When the loopback port control function is enabled on these ports, the
system disables the port, sends a Trap message to the client and removes the
corresponding MAC forwarding entry.
Follow these steps to configure loopback detection for an Ethernet port:
Enter system view
Enable loopback
detection globally
Set the interval for
performing port loopback
detection
Enter Ethernet port view
Enable loopback
detection on a specified
port
Enable loopback port
control on the trunk or
hybrid port
Configure the system to
run loopback detection on
all VLANs of the current
trunk or hybrid port
To do...
system-view
loopback-detection
enable
loopback-detection
interval-time time
interface interface-type
interface-number
loopback-detection
enable
loopback-detection
control enable
loopback-detection
per-vlan enable
Use the command...
1-6
Chapter 1 Port Basic Configuration
Remarks
—
Required
By default, loopback
detection is disabled
globally.
Optional
The default is 30 seconds.
—
Required
By default, port loopback
detection is disabled.
Optional
By default, loopback port
control is not enabled.
Optional
By default, the system
runs loopback detection
only on the default VLAN
of the current trunk or
hybrid port.