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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?
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:
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.
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).