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    Configuring TCC Interface Switching

    TCC joins disparate Layer 2 logical interfaces by means of a virtual Layer 2 switching technique.

    Figure 1 illustrates Layer 2 TCC switching. In this example, Router A is connected by Frame Relay to Router B and Router B is connected by Fast Ethernet to Router C. Router B is a Juniper Networks router. TCC allows you to configure Router B to act as a multiservice Layer 2 switch. To do this, you configure a connection from Router A to Router C that passes through Router B. This effectively establishes Router B as a Frame Relay-to-Fast Ethernet switch and allows the router to switch frames transparently between Router A and Router C without regard to the frames’ contents or the Layer 3 protocols. Router B removes the Frame Relay header from frames arriving on data-link connection identifier (DLCI) 600 and adds an Ethernet header onto the frames before sending them to the Fast Ethernet link.

    Figure 1: Layer 2 TCC Switching

    Layer 2 TCC Switching

    You can configure Layer 2 TCC switching on ATM, Cisco HDLC, Ethernet, extended VLAN, Frame Relay, and PPP circuits. TCC enables unlike interfaces to be connected with a single cross-connect.

    To configure Layer 2 TCC switching, perform the following tasks on the router that is acting as the switch (Router B in Figure 1):

    Modified: 2016-12-16