H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – Port Basic Configuration
H3C S7500 Series Ethernet Switches Chapter 1
Port Basic Configuration
1-5
 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 thus all ports in the group
will have the same configuration as that of the source port.
1.1.5 Configuring Loopback Detection for a Port
Loopback detection is used to monitor if loopback occurs on a 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 terminal and removes the corresponding MAC address forwarding
entry.
z If loopback is found on a trunk or hybrid port, the system disables the port, sends a
Trap message to the terminal and removes the corresponding MAC address
forwarding entry.
Follow these steps to configure loopback detection for a port:
To do… Use the command… Remarks
Enter system view
system-view
—
Enable loopback
detection globally
loopback-detection
enable
Optional
By default, loopback detection
is disabled globally.
Set the time interval for
port loopback
detection
loopback-detection
interval-time time
Optional
The default interval is 30
seconds.
1.1.6 Enabling the System to Test Connected Cable
You can enable the system to test the cable connected to a specific Ethernet electrical
port. The test result will be returned in five seconds. The system can test whether there
is short circuit/open circuit on the RX and TX directions of the cable, and the length of
the faulty cable.
Follow these steps to enable the system to test the cable connected to a specific port: