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Do all switches have to support QinQ?

jwbensley
Level 1
Level 1

If I have three switches in a line like below, and port fa0/1 on Sw1 is for vlan 10, which is trunked to fa0/1 on Sw3,

Sw1  --- Sw2 --- Sw3

If I wanted more VLANs between these ports I could set up a QinQ tunnel but switch 2 doesn't support this, does this matter? Do all switches in a QinQ chain have to support QinQ or will they simply read the outter tag and pass the frames blindly?

Many thanks.

1 Accepted Solution

Accepted Solutions

Edison Ortiz
Hall of Fame
Hall of Fame

For Q-in-Q, only the switches directly connected to the CEs will need it.

The transit switches must have the customer Vlan in their databases and the Vlan(s) must be in forwarding state / not pruned.

View solution in original post

2 Replies 2

Edison Ortiz
Hall of Fame
Hall of Fame

For Q-in-Q, only the switches directly connected to the CEs will need it.

The transit switches must have the customer Vlan in their databases and the Vlan(s) must be in forwarding state / not pruned.

Thank you for the prompt response

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