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Example: Frame Relay to Fast Ethernet TCC Configuration

 
Figure 1: TCC Interface Switching—Frame Relay to Fast Ethernet
TCC Interface Switching—Frame
Relay to Fast Ethernet

In the configuration example in Figure 1, Router A uses Frame Relay to connect with Router B, while Router C connects to Router B by using Fast Ethernet. Router B acts as the Layer 2 virtual switch and transparently connects Router A to Router  C.

You must enable Frame Relay encapsulation on Router A at the physical interface level.

Router A

Router B acts as the virtual switch. Enable the appropriate TCC encapsulations on the corresponding interfaces. In this case, configure the encapsulation frame-relay-tcc option on the logical and physical interfaces of so-0/0/0.600. Next, add the ethernet-tcc encapsulation type to the physical interface of fe-1/0/0. To enable ARP, configure the remote MAC address or IP address of Router C’s Fast Ethernet interface with the remote statement at the [edit interfaces interface-name unit 0 family tcc] hierarchy level. To enable proxy ARP, include the proxy statement at the [edit interfaces interface-name unit 0 family tcc] hierarchy level and specify the IP address of Router A.

After configuring the correct interface encapsulations, complete your cross-connect by adding both interfaces into your MPLS configuration. Include the same interfaces in the interface-switch statement at the [edit protocols connections] hierarchy level.

Router B

Ethernet encapsulation is the default for Router C. Because the Fast Ethernet connection is switched at Layer 2 to reach the Frame Relay link, it is transparent to Layer 3 addressing. As a result, you must configure the IP address for the fe-0/0/0 interface in the same address space as Router A’s so-0/1/0.600 interface.

Optionally, configure static ARP on the fe-0/0/0 interface if you omit the proxy statement on Router B. The arp statement must contain the IP address from interface so-0/1/0.600 on Router A and the MAC address of the Fast Ethernet interface on Router B.

Router C

Verifying Your Work

To verify the operational status of your TCC connection, use the show connections command on Router B:

user@router_b> show connections