3Com Switch 8800 Family Configuration Guide

Ethernet Port Troubleshooting 99
[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.
[3Com-GigabitEthernet2/1/1] port link-type trunk
[3Com-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.
[3Com-GigabitEthernet2/1/1] port trunk pvid vlan 100
Ethernet Port
Troubleshooting
Symptom 1: Default VLAN ID configuration fails.
Solution: Take the following steps:
■ 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.
■ Then configure the default VLAN ID.
Symptom 2: The port is in down status.
Solution: Please check
■ If the cable connection is correct and if the optical fiver cable is inversely
connected.
■ If the shutdown command is used on the port.
■ If the right optical module is inserted.