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Disabling the Control Word for Layer 2 VPNs

A 4-byte control word provides support for the emulated VC encapsulation for Layer 2 VPNs. This control word is added between the Layer 2 protocol data unit (PDU) being transported and the VC label that is used for demultiplexing. Various networking formats (ATM, Frame Relay, Ethernet, and so on) use the control word in a variety of ways.

On networks with equipment that does not support the control word, you can disable it by including the no-control-word statement:




no-control-word;

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

For more information on configuring the control word, see Configuring the Control Word for Layer 2 Circuits and the JUNOS Feature Guide.

Note: Use the no-control word statement to disable the control word when the topology uses generic routing encapsulation (GRE) as the connection mechanism between PEs, and one of the PEs is an M-series router.

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