OAM and QinQ

Serge Vautour sergevautour at yahoo.ca
Tue Sep 7 13:16:16 UTC 2010


We're working on deploying some L2 services over an MPLS network. Our model 
includes a CPE with OAM capabilities and QinQ from the PE to the CPE. For now we 
want to do simple OAM functions from CPE-CPE (no MIPs in the MPLS network). 

Our lab testing has shown some sort of incompatibilities between OAM and QinQ. 
OAM frames are encapsulated with a single VLAN tag (the SVLAN) on the CPE. When 
the PEs only perform SVLAN swapping, everything works fine. If we configure the 
PE to also perform CVLAN manipulation, it drops OAM frames. It likely does not 
know how to process them because they don't have a CVLAN tag. We're working with 
2 CPE vendors and neither of them are able to add 2 VLAN tags to the OAM frames. 

Has anyone else encountered this problem? How do you get around it? One option 
we're looking at is to simply not perform CVLAN manipulation on the PE. This 
means limiting our service to customers. 

Our PEs are all Juniper MX boxes if it helps.


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