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VLL connection does not work between two sides on S7700

Publication Date:  2019-07-12 Views:  351 Downloads:  0

Issue Description

Our two S7700 switches as PE, customer wants to implement martini VLL on S7700. After finished the configuration, the communication between two sides is not ok.
The Topology is like below:
Client 1( 32) ----(vlan 1032) switch ---- (gi3/1/10.1032) PE2  ----- MPLS Network----- PE3(gi2/1/0.32) ------ Client2(

interface GigabitEthernet3/1/1/10.1032
qinq termination pe-vid 1032 ce-vid 32
mpls l2vc 1032

interface GigabitEthernet2/1/0.32
dot1q termination vid 32
mpls l2vc 1032

Handling Process

1.Based on the configuration and VLL process, QinQ termination sub interface will not change the vlan tag and forward it to gi2/1/0.32.
For dot1q sub interface, S7700 will add one tag which will result PE3 send traffic to client2 with three tags. However, client2 cannot recoginze it and the communication is failed.
From the packet analysis on port gi2/1/0.32, we confirm this point.

2.Based on above analysis, we need to delele the outer tag from client1. Suggest below configuration:





Root Cause

Dot1q sub interface will add one tag in VLL scenario.


Change Dot1q sub interface to QinQ vlan stacking sub interface in VLL scenario