Back-to-back Frame-Relay with different DLCI’s for sending and receiving

Back to back Frame-relay can be configured such that between the two routers one router send on one DLCI and receives on another. Let configure it.

Configuring Back to back Frame-Relay with different DLCI’s for sending and receiving

In the example R1 and R3 have a serial cable between their s0/1 interfaces and are directly connected. R1 is going to send on DLCI 103 and R3 is going to send on 301

R1(config)#int s0/1
R1(config-if)#encap frame
R1(config-if)#ip add
R1(config-if)#frame map ip 103
R1(config-if)#frame-relay interface-dlci 301
R1(config-if)#no keep
R1(config-if)#no shut

The magic is in the “frame-relay interface-dlci” command this lets the interface know listen to this DLCI and will respond to packets received on the interface.

Same Configuration for R3  just the DLCI reversed

R3(config)#int s0/1
R3(config-if)#encap frame-relay
R3(config-if)#ip add
R3(config-if)#frame map ip 301
R3(config-if)#frame-relay interface-dlci 103
R3(config-if)#no keep
R3(config-if)#no shut

Next we test the configuration with “debug frame packet” switched on

R3(config-if)#do ping re 1

Type escape sequence to abort.

Sending 1, 100-byte ICMP Echos to, timeout is 2 seconds:


Success rate is 100 percent (1/1), round-trip min/avg/max = 1/1/1 ms




About ccie4all
Hello, and welcome to the first post of my CCIE blog This blog has got one simple goal and that is to improve our skills in Cisco Networking field so we can become best engineers on a job market. Wordpress Blog information about the changes made to Gns3 BGP , MPLS and R&S CCIE labs. In order to access and download all provided materials and receive important updates from Gns3 BGP , MPLS and R&S CCIE labs under GNS3 tab in the main header please go ahead and subscribe to ! All other posts have not been affected and can be accessed at any given time. Enjoy ! Tom

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: