Display And Debug Ethernet Port - 3Com 7700 Configuration Manual

Display and Debug
Ethernet Port
Example: Configuring
the Default VLAN ID of
the Trunk Port
Table 12 Set the Default VLAN ID for the Ethernet Port
Operation
Restore the default VLAN ID of the
trunk port to the default value
Note:
The Trunk port and isolate-user-vlan cannot be configured simultaneously,
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while the hybrid port and isolate-user-vlan can be thus configured. However, if
the default VLAN has been mapped in isolate-user-vlan, you cannot modify the
default VLAN ID until the mapping relationship has been removed.
To guarantee the proper packet transmission, the default VLAN ID of local
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hybrid port or Trunk port should be identical with that of the hybrid port or
Trunk port on the peer switch. The VLAN of hybrid port and trunk port is VLAN
1 by default. The access port is the VLAN to which it belongs.
After configuration, execute the display command in all views to display the
current of the Ethernet port parameters, and to verify the configuration.
Execute the reset command in user view to clear the statistics from the port.
Execute the loopback command in Ethernet port view to check whether the
Ethernet port works normally. In the process of the loopback test, the port cannot
forward the packets. The loop test will finish automatically after being executed
for a while.
Table 13 Display and Debug Ethernet Port
Operation
Configure to perform
loopback test on the Ethernet
port.
Display all the information of
the port
Display hybrid port or trunk
port
Display the information of
VLAN VPN
Clear the statistics information
of the port
Note: The loopback test cannot be performed on the port disabled by the
shutdown command. During the loopback test, the system will disable speed,
duplex, mdi and shutdown operation on the port. Some ports do not support the
loopback test. If performing this command in these ports, you will see the system
prompt.
In this example, the Ethernet Switch (Switch A) is connected to the peer (Switch B)
through the trunk port Ethernet1/0/1. This example shows the default VLAN ID for
the trunk port and verifies the port trunk pvid vlan command. As a typical
application of the port trunk pvid vlan command, the trunk port will transmit
the packets without tag to the default VLAN.
Command
undo port trunk pvid
Command
loopback {external | internal}
display interface {interface_type | interface_type
interface_num | interface_name}
display port {hybrid | trunk}
display port vlan-vpn
reset counters interface [interface_type | interface_type
interface_num | interface_name]
Ethernet Port Overview 33