Alcatel Carrier Internetworking Solutions 6800 User Manual
Troubleshooting 802.1Q
Troubleshooting 802.1Q
page 8-4
OmniSwitch Troubleshooting Guide
September 2005
Question: What needs to be done if the native VLAN needs to be tagged when connected to an
OmniSwitch 7700/7800/8800?
OmniSwitch 7700/7800/8800?
Answer: The Gigabit/Ethernet port can be moved into a different dummy VLAN, and then the tagged
service can be created for the previous native VLAN. CLI Commands are as follows:
service can be created for the previous native VLAN. CLI Commands are as follows:
1 Dummy VLAN 99 created:
>vlan 99
2 A tag service is to be created on port 99 in VLAN 1.
->vlan 99 port default 1/1
3 Tag service created on VLAN 1.
->vlan 1 802.1q 1/1
4 (View the 802.1Q services created on port 1/1.
->show 802.1q 1/1
802.1Q with VLAN ID of 0
A VLAN ID of 0 means that Tag Header contains only user priority information; no VLAN identifier is
present in the frame. This frame will be claimed in the default VLAN for processing.
present in the frame. This frame will be claimed in the default VLAN for processing.
802.1Q and 64 Byte Packets
The Omni Switch 7700/7800/8800 was designed to send out tagged frames with a minimum size of 68
bytes. If the Omni Switch 7700/7800/8800 receives a tagged packet of 64 bytes it will be padded and sent
out 68 bytes (if untagged it will be 64 bytes).
bytes. If the Omni Switch 7700/7800/8800 receives a tagged packet of 64 bytes it will be padded and sent
out 68 bytes (if untagged it will be 64 bytes).