3Com DUA1750-2BAA01 6.5 Ethernet Port Troubleshooting

3Com Switch 8800 Configuration Guide Chapter 6 Ethernet Port Configuration
6-12
II. Network diagram
Switch A Switch B
Figure 6-1 Network diagram for Ethernet port configuration
III. Configuration procedure
The following configurations are used for Switch A. Please configure Switch B in the
similar way.
Enter the Ethernet port view of GigabitEthernet2/1/1.
[SW8800] interface gigabitethernet2/1/1
Set the GigabitEthernet2/1/1 as a trunk port and allows VLANs 2, 6 through 50, and
100 to pass.
[SW8800-GigabitEthernet2/1/1] port link-type trunk
[SW8800-GigabitEthernet2/1/1] port trunk permit vlan 2 6 to 50 100
Create the VLAN 100.
[SW8800] vlan 100
Configure the default VLAN ID of GigabitEthernet2/1/1 as 100.
[SW8800-GigabitEthernet2/1/1] port trunk pvid vlan 100
6.5 Ethernet Port Troubleshooting
Symptom 1: Default VLAN ID configuration fails.
Solution: Take the following steps:
z Execute the display interface or display port command to check if the port is a
trunk port or a hybrid port. If it is neither of them, configure it as a trunk or hybrid
port.
z Then configure the default VLAN ID.
Symptom 2: The port is in down status.
Solution: Please check
z If the cable connection is correct and if the optical fiver cable is inversely
connected.
z If the shutdown command is used on the port.
z If the right optical module is inserted.