The protocol outer-vlan-only command disables an interface from changing the EthType value of the received single-tagged packets.
The undo protocol outer-vlan-only command enables an interface to change the EthType value of the received single-tagged packets.
By default, an interface is enabled to change the EthType value of the received single-tagged packets.
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Usage Scenario
By default, after an interface receives a single-tagged packet, it changes the packet's EthType value before sending the packet out. If the packet's EthType value must remain unchanged, run the protocol outer-vlan-only command to disable the interface from changing the packet's EthType value.
An interface changes the EthType value as follows: If the qinq protocol ethertype-value command is not run, the EthType value in the single VLAN tag is changed to 0x8100. If the qinq protocol ethertype-value command is run, the EthType value in the single VLAN tag is changed to the value specified by ethertype-value.Precautions
The protocol outer-vlan-only command can be run on a Layer 2 or Layer 3 interface, but cannot be run on sub-interfaces.
If an interface receives a double-tagged packet, it changes the EthType in the outer VLAN tag, irrespective of whether the protocol outer-vlan-only command is run.