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 10.1.13.1 255.255.255.0
R1(config-if)#frame map ip 10.1.13.3 103
R1(config-if)#frame-relay interface-dlci 301
R1(config-fr-dlci)#ex
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 10.1.13.3 255.255.255.0
R3(config-if)#frame map ip 10.1.13.1 301
R3(config-if)#frame-relay interface-dlci 103
R3(config-fr-dlci)#ex
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 10.1.13.1 re 1

Type escape sequence to abort.

Sending 1, 100-byte ICMP Echos to 10.1.13.1, timeout is 2 seconds:

!

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

 

 

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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 https://ccie4all.wordpress.com/ 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 https://ccie4all.wordpress.com/ ! All other posts have not been affected and can be accessed at any given time. Enjoy ! Tom

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