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Example: PPP to ATM TCC Configuration

 
Figure 1: TCC Interface Switching—PPP to ATM
TCC Interface Switching—PPP
to ATM

In Figure 1, Router A uses PPP to connect with Router B, while Router C connects with Router B through ATM. Router B acts as the Layer 2 virtual switch and transparently connects Router A to Router C.

On Router A, configure basic PPP encapsulation and any desired Layer 3 protocol families on the SONET/SDH interface.

Router A

Router B acts as the virtual Layer 2 switch. Here you configure the appropriate TCC encapsulations on the corresponding interfaces. In this case, encapsulation ppp-tcc is bound to physical interface so-0/0/0, and encapsulation atm-tcc-vc-mux is placed on VC 32 of interface at-1/1/0. Because the switching occurs at Layer 2, you cannot configure IP addresses or other Layer 3 family information on these interfaces.

You also need to configure MPLS and establish the cross-connect by adding the necessary interfaces to the interface-switch statement at the [edit protocols connections] hierarchy level.

Router B

On Router C, the encapsulation option used to connect to the TCC-encapsulated ATM interface on Router B is atm-vc-mux. Since this ATM connection is switched at Layer 2 to reach the PPP link, it is transparent to Layer 3 addressing. As a result, the IP address must be configured in the same address space as Router A’s so-0/1/0 interface.

Router C

Verifying Your Work

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

user@router_b> show connections