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Configuring Translation Cross-Connect Interface Switching

 

To configure a full-duplex Layer 2.5 translation cross-connect between two routers (A and C), you can configure a Juniper Networks router (Router B) as the TCC interface. Ethernet TCC encapsulation provides an Ethernet wide area circuit for interconnecting IP traffic. Consider the topology in Figure 1 where the Router A-to-Router B circuit is PPP, and the Router B-to-Router C circuit accepts packets carrying standard TPID values.

Figure 1: Sample Topology of Layer 2.5 Translational Cross-Connect
Sample Topology of Layer 2.5 Translational
Cross-Connect

If traffic flows from Router A to Router C, the Junos OS strips all PPP encapsulation data from incoming packets and adds Ethernet encapsulation data before forwarding the packets. If traffic flows from Router C to Router A, the Junos OS strips all Ethernet encapsulation data from incoming packets and adds PPP encapsulation data before forwarding the packets.

To configure the router as the translational cross-connect interface:

  1. In the configuration mode, at the [edit] hierarchy level, first configure the interface that is connected to Router A.
  2. (Optional) Specify the description of the interface. For example, you could specify the interface name on Router A that is connected to this interface.
  3. Specify the encapsulation. If the Router A to Router B circuit is PPP, then specify ppp-tcc as the encapsulation. If the Router A to Router B circuit is frame relay, specify frame-relay-tcc.
  4. In the configuration mode, at the [edit] hierarchy level, first configure the interface that is connected to Router C.
  5. (Optional) Specify the description of this interface. For example, you could specify the interface name on Router C that is connected to this interface.
  6. Specify the encapsulation. If the Router B to Router C circuit is Ethernet, then specify ethernet-tcc as the encapsulation. If the Router B to Router C circuit is ATM, specify atm-tcc-vc-mux.
  7. Specify the IP address or MAC address of the remote router to provide address resolution protocol (ARP) for the TCC router’s Ethernet-based neighbor using the remote statement. You must specify the statement at the [edit interfaces interface-name unit unit-number family tcc] hierarchy level. You can a specify the MAC address of the remote router instead of the IP address. The MAC address is the physical Layer 2 address of the Ethernet neighbor.
  8. Specify the IP address of the non-Ethernet TCC neighbor for which the TCC router is acting as a proxy using the proxy statement. You must specify the statement at the [edit interfaces interface-name unit unit-number family tcc] hierarchy level.

To verify the TCC connection, use the show connections command on TCC router.