Frame Relay Back to Back - Same DLCIs?

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

Hi,

I know the below FR config is correct for a babk to back FR topology. The problem is that I don't under stand why the DLCIs HAVE to be the same at either end (particularly give that DLCIs are locally significant). Can someone please help?
Many thanks.

R1:
interface Serial0/0/1
encapsulation frame-relay
frame-relay map ip 192.168.0.5 102
frame-relay map ip 192.168.0.6 102 broadcast

R3:
frame-relay switching
interface Serial0/0/0
encapsulation frame-relay
clockrate 64000
frame-relay map ip 192.168.0.6 102
frame-relay map ip 192.168.0.5 102 broadcast
frame-relay intf-type dce

 

Oh man! Ad-blocking software has been detected! :'(

This website is run by the community, for the community... and it needs advertisements in order to keep running. Blocking our ads means your killing our stats!
Please disable your ad-block, or become a premium member to hide all advertisements and this notice.

You are correct, dlci's are only locally significant - but in the case of a back to back FR configuration there is no frame switch in between the routers, so they must agree on the dlci that will be used.

Spice Weasel