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;
You can include this statement at the following hierarchy levels:
[edit routing-instances routing-instance-name protocols l2vpn]
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols l2vpn]
For more information about configuring the control word, see Configuring the Control Word for Layer 2 Circuits and the Layer 2 Circuits User Guide.
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.