# 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 Example: Configuring Frame Relay over MPLS
- encapsulation frame-relay ietf
- frame-relay interface-dlci ietf
- frame-relay intf-type
- frame-relay lmi-type
- interface serial
- mpls-relay
- route interface