Frame Relay topology , frame route question

JeanM

I am labbing frame-relay using physical hardware, and ran into an issue I can't resolve.

So, for topology I am using this - Frame Relay Switch Configuration For Cisco Lab

I am using 2620 with 4port serial module as the frame relay switch, call it FR. R1-R3 are 3 more 2620s with serial cards.

http://www.youtube.com/watch?feature=player_embedded&v=nt2emIMuujg

In this example, I've got three Cisco routers that are going to be the production routers in my lab - R1, R2, and R3. I have a fourth router that will serve as the frame relay switch. The DLCI assignments I've come up with are as follows:

• R1 is the hub and will use DLCI 122 to reach R2, DLCI 123 to reach R3.
• R2 is a spoke router and will use DLCI 221 to reach both R1 and R3.
• R3 is a spoke router and will use DLCI 321 to reach both R1 and R2.
  
  

Configuration on the "FR" switch is as follows -

interface Serial1/1
no ip address
encapsulation frame-relay
clockrate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 122 interface Serial2 221
frame-relay route 123 interface Serial3 321
!
interface Serial1/2
no ip address
encapsulation frame-relay
clockrate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 221 interface Serial1 122

interface Serial1/3
no ip address
encapsulation frame-relay
logging event subif-link-status
logging event dlci-status-change
clockrate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 321 interface Serial1 123


On the R1-R3 routers I've assigned 192.168.2.1, 2.2 and 3.2 addresses /24 subnet mask.
I have connectivity between R1 and R2, and between R1 and R3. So this makes sense and it works.


Now, my problem is how do I add connectivity between R2 and R3?

I tried adding dlci 223 and 322 for frame-frelay route on R2 and R3, using the frame-relay route 223 interface Serial2 322 to R2 serial interface AND frame-relay route 322 interface Serial3 322 to R3 serial interface but that didn't work, it only would accept serial0-1 for some reason .


And I just end up with the following route below -

FrameRelay#sh frame-relay route
Input Intf Input Dlci Output Intf Output Dlci Status
Serial1/1 122 Serial1/2 221 active
Serial1/1 123 Serial1/3 321 active
Serial1/2 221 Serial1/1 122 active
Serial1/2 223 Serial1/1 322 inactive
Serial1/3 321 Serial1/1 123 active
Serial1/3 322 Serial1/1 223 inactive

DCD

You have to use sub-interface.

JeanM

That's one way to do it. Another way with multi-point frame-relay for the spoke routers to learn about each other via route advertisement and "dynamic" frame relay map right?

I get the difference between the point to point and multi-point frame relay, but really trying to 100% understand it while implementing it with my own "frame relay cloud"... and not just configuring the end routers.