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Example: Frame Relay to Fast Ethernet TCC Configuration

Figure 86: TCC Interface Switching—Frame Relay to Fast Ethernet

Image g017140.gif

In the configuration example in Figure 86, 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



[edit]
interfaces {


so-0/1/0 {
description "to Router B so-0/0/0";
encapsulation frame-relay;


unit 600 {
point-to-point;
dlci 600;


family inet {
address 10.1.1.1/30;
}


}


}


}

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



[edit]
interfaces {


so-0/0/0 {
description "to Router A so-0/1/0";
dce;
encapsulation frame-relay-tcc;


unit 600 {
point-to-point; 
encapsulation frame-relay-tcc;
dlci 600;
}


}




fe-1/0/0 {
description "to Router C fe-0/0/0";
encapsulation ethernet-tcc;


unit 0 {


family tcc {
protocol inet


remote { # Addresses associated with the Ethernet TCC neighbor
Router C.
mac-address cc:cc:cc:cc:cc:cc; # Or, specify Router C’s
IP address here.
}




proxy { # Addresses associated with the other TCC neighbor—Router
A.
inet-address 10.1.1.1;
}


}


}


}


}
protocols {


    mpls {
interface so-0/0/0.600;
interface fe-1/0/0.0;
}




connections {


interface-switch FR-to-Ether {
interface so-0/0/0.600;
interface fe-1/0/0.0;
}


}


}

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



[edit]
interfaces
fe-0/0/0 {
description "to Router B fe-1/0/0";


unit 0 {


family inet {


address 10.1.1.2/30 {
arp 10.1.1.1 mac bb:bb:bb:bb:bb:bb; # Configure this only
if you did not
}


}


}


}

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