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4

Let's say that it is a 'new protocol heavily based on L2TPv2'. It shares a lot of the messages, constructs, flows with L2TPv2 but it is not strictly backwards compatible. It does have an L2TP 'compatibility' scheme as indicated in section 4.7 of the RFC, but that comes with limitations. The most significant changes are actually listed directly in the RFC: ...


1

On the Juniper side, you want to pop the 802.1Q tag on ingress and push upon egress. This way, the frame is untagged while traversing the MPLS core and when it reaches the Cisco. Below is how you configure it (doc link). Note there are varying per-platform limitations of this configuration and not all Juniper boxes will necessarily support this. unit X { ...


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