The etype (ethertype) of QinQ

This article provides information about the etype difference between dot1q-tunneling and mapping a Specific Interface for QinQ implementation.

Information about the etype difference between dot1q-tunneling and mapping a Specific Interface for QinQ implementation.

Ethertype of QINQ:

  • 0x8100 is the standard ethertype for single tagged frames (802.1Q).
  • 0x88a8 is the standardized value for QinQ (802.1ad).
  • 0x9100 (non-standard QinQ ethertype) can be used especially in a multi-vendor environment.

When dot1q-tunneling is enabled on an EX switch, the default etype is 0x88a8. When mapping a specific Interface is enabled, the default etype is 0x8100. You should be careful with other vendors for QinQ; if there a wrong etype configuration is present, the following error message is generated:

 

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