Frame Relay

NightEye00

Hi everyone,

I'd like to get some info on configuring Frame Relay.

1. If I have to configure point-to-multipoint subinterfaces as well as point-to-point ones (full- and partial-mesh hybrid design), how can I connect more than 1 router to the same physical access link, on which the multipoint interfaces have been configured?
I see the logic of multipoint subinterfaces but I don't get the idea of connecting the devices together in case of that...

2. I looked after some example configs. Among others an official Cisco config showed that DLCI values on a local router have to be configured in the way of setting them to the opposite side's DLCI value.
In other words, if I configure Router1 at the moment and I'd like to set the DLCI value for this router, I have to set it to the opposite router's DLCI value. Is it true? I ask this only because I learned from the official Cert Guide that only the local DLCI values can be configured on a local router, where "local" means the router's PVC-connected interface (and not the opposite side's DLCI of the access link).

Thank you for your answer and guide!

kohr-ah

1. You would go to a frame relay switch.
Configuring a Cisco Router as a Frame Relay Switch > Cisco Frame Relay Configurations
^ Example how to configure a router to become one.

2. The DLCI value is locally significant as an identification source per hop. Usually the reason that labs and people give examples as ROUTER A - 102 and ROUTER B - 201

Imagine if you gave everyone 102. You would have a heck of a time of keeping track of multiple frame relays for different customers.

What actually happens however is you are mapping your layer 3 IP to your layer 2 DLCI.
Comprehensive Guide to Configuring and Troubleshooting Frame Relay - Cisco

^ Great read on this.