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QinQ Traffic Forwarding Fails Because the Interface Does Not Transparently Transmit the Outer VLAN ID
Fault Symptom
After selective QinQ is configured on an interface, traffic forwarding fails.
Procedure
- Run the display this command in the view of the interface configured with selective QinQ to check the outer VLAN tag.
- Run the display vlan vlan-id command in any view to check whether the interface configured with selective QinQ belongs to the outer VLAN. vlan-id specifies
the outer VLAN ID.
<HUAWEI> display vlan 3 -------------------------------------------------------------------------------- U: Up; D: Down; TG: Tagged; UT: Untagged; MP: Vlan-mapping; ST: Vlan-stacking; #: ProtocolTransparent-vlan; *: Management-vlan; -------------------------------------------------------------------------------- VID Type Ports -------------------------------------------------------------------------------- 3 common UT:GE1/0/2(U) VID Status Property MAC-LRN Statistics Description -------------------------------------------------------------------------------- 3 enable default enable disable VLAN 0003
- If the system displays the message "Error:The VLAN does not exist.", the outer VLAN is not created. Run the vlan batch command to create the outer VLAN and run the display vlan vlan-id command to check whether the interface belongs to the VLAN.
- If there is no interface configured with selective QinQ, run the port hybrid untagged vlan vlan-id command to add the interface to the VLAN in untagged mode.
- If the command output does not display the interface configured with selective QinQ but the flag before the interface is not UT, run the port hybrid untagged vlan vlan-id command to add the interface to the VLAN in untagged mode.
- If the command output displays the interface configured with selective QinQ and the interface has joined the VLAN in untagged mode, continue to check for other common misconfigurations.