H3C Technologies H3C S3100 Series Switches - Manual (Page 130)

Operation Manual – Port Basic Configuration
H3C S3100-52P Ethernet Switch Chapter 1 Port Basic Configuration
1-8
Note:
z
If you specify a source aggregation group ID, the system will use the port with the
smallest port number in the aggregation group as the source.
z
If you specify a destination aggregation group ID, the configuration of the source
port will be copied to all ports in the aggregation group and all ports in the group will
have the same configuration as that of the source port.
1.2.8 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.
z
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.
z
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.
Table 1-10
Set loopback detection for an Ethernet port
Operation Command Remarks
Enter system view
system-view
—
Enable loopback
detection globally
loopback-detection
enable
Optional
By default, loopback detection
is disabled globally.
Set time interval for
port loopback
detection
loopback-detection
interval-time time
Optional
The default interval is 30
seconds.
Enter Ethernet port
view
interface
interface-type
interface-number
—
Enable loopback
detection on a
specified port
loopback-detection
enable
Optional
By default, port loopback
detection is disabled.
Enable loopback port
control on the trunk or
hybrid port
loopback-detection
control enable
Optional
By default, loopback port
control is not enabled.