Define the Encapsulation for Layer 2 TCC Switching

To begin configuring Layer 2 TCC switching, configure TCC encapsulation on the desired interfaces of the router that is acting as the switch (Router B in Figure 30).

You cannot configure standard protocol families on TCC or CCC interfaces. Only the CCC family is allowed on CCC encapsulated interfaces. Likewise, only the TCC family is allowed on TCC-encapsulated interfaces.

For ATM connections, specify the encapsulation type when configuring ATM virtual circuits (VCs) at the [edit interfaces interface-name unit unit-number] hierarchy level. For each VC, you configure whether it is a circuit or a regular logical interface. The default interface type is point-to-point.

[edit]

interfaces {

    at-fpc/pic/port {

        atm-options {

            vpi vpi-identifier maximum-vcs maximum-vcs;

        }

        unit logical-unit-number {

            point-to-point;                                 # Default interface type

            encapsulation (atm-tcc-vc-mux | atm-tcc-snap);

            vci vpi-identifier.vci-identifier ;

        }

    }

}

For Cisco HDLC and PPP circuits, specify the encapsulation in the encapsulation statement at the [edit interfaces interface-name] hierarchy level. This statement configures the entire physical device. Also, you must configure the logical interface unit 0.

[edit]

interfaces {

    type-fpc/pic/port {

        encapsulation (cisco-hdlc-tcc | ppp-tcc);

        unit 0;

    }

}

You can specify the encapsulation for Frame Relay circuits at the [edit interfaces interface-name] hierarchy level and the [edit interfaces interface-name unit unit-number] hierarchy level. For TCC and CCC interfaces, the DLCI value must be configured in the range of 512 through 1022. The default interface type is point-to-point.

[edit]

interfaces {

    type-fpc/pic/port {

        encapsulation frame-relay-tcc;

        unit logical-unit-number {

            point-to-point;                                 # Default interface type

            encapsulation frame-relay-tcc;

            dlci dlci-identifier ;

        }

    }

}