Frame Relay
NightEye00
Member Posts: 21 ■□□□□□□□□□
in CCNA & CCENT
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!
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!
Comments
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kohr-ah
Member Posts: 1,277
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.