Example: Frame Relay to Fast Ethernet TCC Configuration

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 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.

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.

Verifying Your Work

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

CCC and TCC connections [Link Monitoring On]
  Legend for status (St)              Legend for connection types
  UN -- uninitialized                 if-sw:  interface switching
  NP -- not present                   rmt-if: remote interface switching
  WE -- wrong encapsulation           lsp-sw: LSP switching
  DS -- disabled
  Dn -- down                          Legend for circuit types
  -> -- only outbound conn is up      intf -- interface
  <- -- only inbound  conn is up      tlsp -- transmit LSP
  Up -- operational                   rlsp -- receive LSP
Connection/Circuit                  Type    St  Time last up     # Up trans
FR-to-Ether                         if-sw   Up  Dec 30 09:57:23           1
  so-0/0/0.600                      intf    Up
  fe-1/0/0.0                        intf    Up