This document is a sample configuration for setting up two Cisco routers back-to-back using Frame Relay (FR) encapsulation. The routers are connected using data communications equipment (DCE) and a data terminal equipment (DTE) serial cable. Back-to-back setups are useful in test environments. The simplest and preferred method for configuring back-to-back setups is described in this document. | Back-to-Back Frame Relay - External Link Solutions 11 PrOtluCU Support Partners 11 Trainin CrJrporatB Sample Configurations Back-to-Back Frame Relay Contents Introduction Hardware and Software Versions Network Diagram Configurations Command Summary show Commands Related Information Introduction This document is a sample configuration for setting up two Cisco routers back-to-back using Frame Relay FR encapsulation. The routers are connected using data communications equipment DCE and a data terminal equipment DTE serial cable. Back-to-back setups are useful in test environments. The simplest and preferred method for configuring back-to-back setups is described in this document. A FR switch or DCE device is used between FR routers to provide Local Management Interface LMI status messages. Because there is no switch in a back-to-back scenario LMI processing is disabled on both routers. You also can configure a back-to-back setup with one router providing LMI status updates for the other. However such a configuration is necessary only if the LMI debugging messages are to be checked in a back-to-back setup. In this case LMI processing is not disabled and one side functions as a hybrid FR switch by responding to LMI status enq. For more details on this configuration please see Back-to-Back Frame Relay Hybrid Switching. In the sample configuration the router connected to the DCE cable must provide clocking. Router1 provides the clock at 64 kbps clock rate 64000 . http warp public 125 1 of 5 4 19 2001 9 01 08 PM Back-to-Back Frame Relay - External Link Hardware and Software Versions To implement this configuration you need the following hardware and software components Cisco IOS Software Release and later that supports FR encapsulation. Two routers each with an interface that supports FR encapsulation. Note The information in this document was taken from an isolated lab environment. Make sure you understand the potential impact of a .
