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# Configuring Interoperation with Legacy Frame Relay Layer 2 Services

To configure the router to interoperate with a router that uses the legacy Frame Relay pseudowire type for layer 2 services over MPLS:

1. Configure the Frame Relay interface.
   `
   host1(config)#interface serial 4/1:1/1
   host1(config-if)#encapsulation frame-relay ietf
   host1(config-if)#frame-relay intf-type dte
   host1(config-if)#frame-relay lmi-type ansi
   host1(config-if)#interface serial 4/1:1/1.1
   host1(config-subif)#frame-relay interface-dlci 17 ietf
   `
2. Specify MPLS tunneling by using the appropriate command.
   `
   host1(config-if)#mpls-relay 10.10.100.2 45 relay-format frame-relay
   `

   or

   `
   host1(config-if)#route interface tunnel mpls:tunnel6 45 relay-format frame-relay
   `
3. Configure Frame Relay and MPLS on the remote PE router.

#### Related Topics

- For information about configuring a more complex Frame Relay over MPLS topology, see Frame Relay over MPLS Configuration Example
- encapsulation frame-relay ietf
- frame-relay interface-dlci ietf
- frame-relay intf-type
- frame-relay lmi-type
- interface serial
- mpls-relay
- route interface

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