2 Replies Latest reply: Feb 6, 2012 10:00 AM by Martin RSS

    Setting Up Frame Relay Using 3 Routers

    alan

      Is it possible to setup a frame relay lab using 3 routers where you can ping the interfaces on the router being used as the frame-relay switch?  For example:

       

      R1 is the frame-relay switch. Int S 1/0 is connected to int S 1/0 on R2. and R1 int S 1/1 is connected to int S 1/0 on R3.  I can do a setup where R2 and R3 are the spokes with R1 being the hub. Both R2 and R3 can ping one another.

       

      What I can't figure out is how to put an ip address on R1 interfaces where I can ping R2 and R3 from R1 and vice-versa. 

       

      After setting up frame-relay on R1 interfaces, I enter the following information for R1

       

      int S 1/0

      frame-relay route 100 int s 1/1 200

      int S 1/1

      frame-relay route 200 int s 1/0 100

       

      R2 is setup as a multipoint interface:

       

      int s 1/0.2 multipoint

      ip address 172.12.123.2   255.255.255.0

      frame-relay map ip 172.12.123.3 100 broadcast

       

      R3 is setup as a point-to-point intreface

       

      int s 1/0.3 point-to-point

      ip address 172.12.123.3   255.255.255.0

      frame-relay interface-dlci 200 broadcast

       

      What I'm missing is how to setup the interfaces on R1 so I can ping them from the other routers.  I appreciate any suggestions.

        • 1. Re: Setting Up Frame Relay Using 3 Routers
          alan

          I figured it on my own. I connected R1 int s 1/3 to R3 int s 1/3 and configured frame relay on both interfaces along with ip addresses in the same subnet.  R1 is the frame-relay switch.  I was able to ping R1 from  R3 and vice versa but I could not ping R1 from R2.

           

          I tried different scenarios including adding frame-relay routes statements with the dlcis on R1 int s 1/0 (which was connnected to R2) and int s 1/1 (which was connected to R3) but nothing worked.  I removed these last statements.

           

          Since R2 int s 1/0.2 was a multipoint subinterface, I just had to add the new ip addresses for R1 and R3 to the dlci (same dlci for all 3 ip addresses)

           

          int s 1/0.2 multipoint

          frame-relay map ip 172.12.123.1 100 broadcast

          frame-relay map ip 172.12.123.7 100 broadcast.

           

          The first ip address is for R1 and the second ip address is for R3.

           

          I have ip addresses on the following interfaces:

           

          R1:

          int s 1/0 no ip address

          int s 1/1 no ip address

          int s 1/3.1   172.12.123.1  255.255.255.0 (point-to-point - connected to R3 s 1/3)

           

          R2

          int s 1/0.2   172.12.123.2 255.255.255.0 (multipoint - connected to R1  int s 1/0)

           

          R3

          int s 1/0.3  172.12.123.1 255.255..255.0 (point-to-point  connected to R1 int s 1/1)

          int s 1/3      172.12.123.7 255.255.255.0 (point-to-point) connected to R1 int s 1/3)

          • 2. Re: Setting Up Frame Relay Using 3 Routers
            Martin

            FR over Hub-spoke; There are 3 common things to check for FR to work :

             

            broadcast in frame-relay map statments;

            Split Horizon on hub;

            adding map statments on Spokes saying "to ping other spoke go thru hub"

             

            there are some examples in my docs; if u still need help or have question, show us running config(s)