3com 4210 PWR 9-Port 3CR17341-91-ME User Manual
Product codes
3CR17341-91-ME
Ethernet Port Configuration
101
■
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.
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.
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.
c
CAUTION:
■
To enable loopback detection on a specific port, you must use the
loopback-detection enable command in both system view and the specific
port view.
loopback-detection enable command in both system view and the specific
port view.
■
After you use the undo loopback-detection enable command in system
view, loopback detection will be disabled on all ports.
view, loopback detection will be disabled on all ports.
Enabling Loopback Test
You can configure the Ethernet port to run loopback test to check if it operates
normally. The port running loopback test cannot forward data packets normally.
The loopback test terminates automatically after a specific period.
normally. The port running loopback test cannot forward data packets normally.
The loopback test terminates automatically after a specific period.
Table 64 Configure loopback detection for an Ethernet port
Operation
Command
Remarks
Enter system view
system-view
-
Enable loopback detection
globally
globally
loopback-detection enable Required
By default, loopback
detection is disabled globally.
detection is disabled globally.
Set the interval for performing
port loopback detection
port loopback detection
loopback-detection
interval-time time
interval-time time
Optional
The default is 30 seconds.
Enter Ethernet port view
interface interface-type
interface-number
interface-number
-
Enable loopback detection on
a specified port
a specified port
loopback-detection enable Required
By default, port loopback
detection is disabled.
detection is disabled.
Enable loopback port control
on the trunk or hybrid port
on the trunk or hybrid port
loopback-detection control
enable
enable
Optional
By default, loopback port
control is not enabled.
control is not enabled.
Configure the system to run
loopback detection on all
VLANs of the current trunk or
hybrid port
loopback detection on all
VLANs of the current trunk or
hybrid port
loopback-detection
per-vlan enable
per-vlan enable
Optional
By default, the system runs
loopback detection only on
the default VLAN of the
current trunk or hybrid port.
loopback detection only on
the default VLAN of the
current trunk or hybrid port.
Table 65 Enable loopback test
Operation
Command
Remarks
Enter system view
system-view
-
Enter Ethernet port view
interface interface-type
interface-number
interface-number
-
Enable loopback test
loopback { external |
internal }
internal }
Optional