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FAQ-How Does the PW Process VLAN Tags When the QinQ Termination Subinterface of the NE40E Connects to the VPLS

Publication Date:  2012-07-27 Views:  3 Downloads:  0
Issue Description
Q:
How does the PW process VLAN tags when the QinQ termination subinterface of the NE40E connects to the VPLS in symmetric mode and to the VPLS in asymmetric mode? 
 
Alarm Information
Null
Handling Process
A:
When packets flow into the VSI from the AC:
(1) In case the VLANs are symmetric and the VSI encapsulation mode is Ethernet: Delete outer tags.
(2) In case the VLANs are symmetric and the VSI encapsulation mode is VLAN: No processing is conducted, with inner and outer tags reserved.
(3) In case the VLANs are asymmetric and the VSI encapsulation mode is Ethernet: Delete inner and outer tags.
(4) In case the VLANs are asymmetric and the VSI encapsulation mode is VLAN: Delete outer tags.
When packets flow into the AC from the VSI:
(1) In case the VLANs are symmetric and the VSI encapsulation mode is Ethernet: Add outer tags.
(2) In case the VLANs are symmetric and the VSI encapsulation mode is VLAN: Replace outer tags with the tags encapsulated by the outbound interface of the PE.
(3) In case the VLANs are asymmetric and the VSI encapsulation mode is Ethernet: Add inner and outer tags.
(4) In case the VLANs are asymmetric and the VSI encapsulation mode is VLAN: Delete outer tags and then add inner and outer tags encapsulated by the outbound interface of the PE. 
 
Root Cause
Null
Suggestions
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