2 Replies Latest reply: May 22, 2019 11:02 AM by sshishi1234 RSS

    Frame Relay 3 config types

    sshishi1234


      hi all


      There are three types of Frame Relay topology to choose from. Full, star and partial Mesh. I have three config examples prepared.

       

      If I use FULL mesh topology, I configure as below:

      I am using this config and link are up up but pvc inactive. Ive read that if im using point-to-point I do not need maping and this should simply work? I presume cause inverse arp kicks in.. Ive watched about 3 videos all saying this is all I need…

      My DCLI is also unused but when router comes up I see a DLCI message saying active

      Sh int ser 0/0 shows MLI sent 1472 recvd 1472 LMI upd recevd 0 DTE LMI up... I can't ping my remote sites... but can ping all Eigrp neighbors... is this because its a sim??Should I think my config is fine and thought it might be a simulator bug?

       

      Router 1:

      Int S0/0

      Encapsulation Frame-relay

      Int s0/0.1 point-to-point

      Ip add 10.0.0.1 255.0.0.0

      Frame-relay interface-dcli 102

      Int s0/0.2 point-to-point

      Ip add 20.0.0.1 255.0.0.0

      Frame-relay interface-dcli 102

      Int s0/0.3 point-to- point

      Ip add 30.0.0.1 255.0.0.0

      Frame-relay interface-dcli 103

       

      Router 2:

      Int S0/0

      Encapsulation Frame-relay               

      Int s0/0.1 point-to-point

      Ip add 10.0.0.2 255.0.0.0

      Frame-relay interface-dcli 201

      Int s0/0.2 point-to-point

      Ip add 20.0.0.2 255.0.0.0

      Frame-relay interface-dcli 202

      Int s0/0.3 point-to- point

      Ip add 30.0.0.2 255.0.0.0

      Frame-relay interface-dcli 203

       

      Router 3:

      Int S0/0

      Encap frame relay

      Int s0/0.1 point-to-point

      Ip add 10.0.0.3 255.0.0.0

      Frame-relay interface-dcli 301

      Int s0/0.2 point-to-point

      Ip add 20.0.0.3 255.0.0.0

      Frame-relay interface-dcli 302

      Int s0/0.3 point-to- point

      Ip add 30.0.0.3 255.0.0.0

      Frame-relay interface-dcli 303

       

       

      Next:

      If i want to use the star topology I need to add the interface DLCI To int on hub router

      And map the PVC to next hop…..also having Eigrp connection I would remove split horizon from hub interface. ..again my PVCs are inactive .. my map is active

       

      Router 1:

      Int ser0/0.1 mulitpoint

      Ip address 10.0.0.1 255.0.0.0

      no ip split horizon Eigrp 100

      Encapsulation Frame-relay

      Frame-relay map ip 10.0.0.2 102 broadcast

      Frame-relay map ip 10.0.0.3 103 broadcast
      Frame-Relay lmi-type cisco

       

      Router2:

      Int ser0/0.2 multipoint

      Ip address 10.0.0.2 255.0.0.0

      Encapsulation Frame-relay

      Frame-relay map ip 10.0.0.1 201 broadcast

      Frame-relay map ip 10.0.0.3 203 broadcast

      Frame-relay lmi-type cisco

       

      Router3:

      Int ser0/0.3 multipoint

      Ip address 10.0.0.3 255.0.0.0

      Encapsulation Frame-relay

      Frame-relay interface map ip 10.0.0.1 301 broadcast

      Frame-relay interface map ip 10.0.0.2 302 broadcast

      Frame-Relay lmi-type cisco

       

      Thirdly and lastly.... physical ints. PVC is empty...map is ok on all 3… sh fr pvc is empty on R2  and R1 but active on R3. I do not use map ip command here because I have inverse arp – is that correct? All pings ok

       

      Router1:

      int ser0/0

      ip add 10.0.0.1 255.0.0.0

      no ip split horizon  eigrp 10

      Encapsulation frame-relay

      Frame-relay interface-dcli 101

       

      Router2:

      int ser0/0

      ip add 10.0.0.2 255.0.0.0

      encapsulation frame-relay

      Frame-relay interface-dcli 201

       

      Router3:

      int ser0/0

      ip add 10.0.0.3 255.0.0.0

      encapsulation frame-relay

      Frame-relay interface-dcli 301

       

       

      Thanks

         
        • 1. Re: Frame Relay 3 config types
          Ing_Percy

          Hi!

           

          About first case

          sshishi1234 escribió:

          Router 1:

          Int S0/0

          Encapsulation Frame-relay

          Int s0/0.1 point-to-point

          Ip add 10.0.0.1 255.0.0.0

          Frame-relay interface-dcli 102

          Int s0/0.2 point-to-point

          Ip add 20.0.0.1 255.0.0.0

          Frame-relay interface-dcli 102

          Int s0/0.3 point-to- point

          Ip add 30.0.0.1 255.0.0.0

          Frame-relay interface-dcli 103

           

          Router 2:

          Int S0/0

          Encapsulation Frame-relay               

          Int s0/0.1 point-to-point

          Ip add 10.0.0.2 255.0.0.0

          Frame-relay interface-dcli 201

          Int s0/0.2 point-to-point

          Ip add 20.0.0.2 255.0.0.0

          Frame-relay interface-dcli 202

          Int s0/0.3 point-to- point

          Ip add 30.0.0.2 255.0.0.0

          Frame-relay interface-dcli 203

           

          Router 3:

          Int S0/0

          Encap frame relay

          Int s0/0.1 point-to-point

          Ip add 10.0.0.3 255.0.0.0

          Frame-relay interface-dcli 301

          Int s0/0.2 point-to-point

          Ip add 20.0.0.3 255.0.0.0

          Frame-relay interface-dcli 302

          Int s0/0.3 point-to- point

          Ip add 30.0.0.3 255.0.0.0

          Frame-relay interface-dcli 303

          In a point-to-point, each subinterface is acting like a point-to-point interface. For that reason, generally there is a separate subnet for each point-to-point VC.

           

          You must apply the following:

          R1-R2: One subnet, for example: 10.0.0.0/30

          R1-R3: One subnet, for example: 10.0.0.4/30

          R2-R3: One subnet, for example: 10.0.0.8/30

           

          Here is an example using a point-to-point frame relay

          Configuring Point-to-Point Frame Relay Sub-Interfaces | Free CCNA Workbook

           

          About second case:

          sshishi1234 escribió:

          Router 1:

          Int ser0/0.1 mulitpoint

          Ip address 10.0.0.1 255.0.0.0

          no ip split horizon Eigrp 100

          Encapsulation Frame-relay

          Frame-relay map ip 10.0.0.2 102 broadcast

          Frame-relay map ip 10.0.0.3 103 broadcast
          Frame-Relay lmi-type cisco

           

          Router2:

          Int ser0/0.2 multipoint

          Ip address 10.0.0.2 255.0.0.0

          Encapsulation Frame-relay

          Frame-relay map ip 10.0.0.1 201 broadcast

          Frame-relay map ip 10.0.0.3 203 broadcast

          Frame-relay lmi-type cisco

           

          Router3:

          Int ser0/0.3 multipoint

          Ip address 10.0.0.3 255.0.0.0

          Encapsulation Frame-relay

          Frame-relay interface map ip 10.0.0.1 301 broadcast

          Frame-relay interface map ip 10.0.0.2 302 broadcast

          Frame-Relay lmi-type cisco

          I implemented it in GNS3 and it works

          fr1.JPG

          fr2.JPG

          When you enable the interfaces, in some minutes you could see the active status

           

          R1#sh frame-relay map

          Serial0/0.1 (up): ip 10.0.0.2 dlci 102(0x66,0x1860), static,

                        broadcast,

                        CISCO, status defined, active

          Serial0/0.1 (up): ip 10.0.0.3 dlci 103(0x67,0x1870), static,

                        broadcast,

                        CISCO, status defined, active

           

          R2#sh frame-relay map

          Serial0/0.2 (up): ip 10.0.0.1 dlci 201(0xC9,0x3090), static,

                        broadcast,

                        CISCO, status defined, active

          Serial0/0.2 (up): ip 10.0.0.3 dlci 203(0xCB,0x30B0), static,

                        broadcast,

                        CISCO, status defined, active

           

          R3#sh frame-relay map

          Serial0/0.3 (up): ip 10.0.0.1 dlci 301(0x12D,0x48D0), static,

                        broadcast,

                        CISCO, status defined, active

          Serial0/0.3 (up): ip 10.0.0.2 dlci 302(0x12E,0x48E0), static,

                        broadcast,

                        CISCO, status defined, active

           

          About third case:

          sshishi1234 escribió:

          Router1:

          int ser0/0

          ip add 10.0.0.1 255.0.0.0

          no ip split horizon  eigrp 10

          Encapsulation frame-relay

          Frame-relay interface-dcli 101

           

          Router2:

          int ser0/0

          ip add 10.0.0.2 255.0.0.0

          encapsulation frame-relay

          Frame-relay interface-dcli 201

           

          Router3:

          int ser0/0

          ip add 10.0.0.3 255.0.0.0

          encapsulation frame-relay

          Frame-relay interface-dcli 301

          How is configuring your FR switch?

          Put the configuration

           

          Some considerations:

          Physical interfaces have inverse-arp enabled by default.  Remember, every single DLCI the frame-relay router learns about via LMI from the frame-relay switch is going to be mapped to the physical frame-relay interface by default.  You can see this with the show frame-relay pvc command.

           

          *If you have an IP address on the interface, the router will send an Inverse-ARP request out every single DLCI associated with the interface.  If you have no other sub-interfaces with DLCIs assigned via frame-relay interface-dlci or frame-relay map commands this means ALL of them!

           

          *Adding the command frame-relay interface-dlci does nothing because all the DLCIs learned from the frame switch are already associated with the interface. Therefore adding this command on a physical interface does not disable inverse-ARP in any way

           

          *Adding the command frame-relay map for a manual IP/DLCI mapping will disable inverse-ARP for that particular DLCI on the interface.  Note that inverse-ARP requests will still be sent on any other DLCIs associated with the physical interface

           

          More information: Understanding Frame-Relay Inverse-ARP – Astorino Networks

           

          Regards!

          • 2. Re: Frame Relay 3 config types
            sshishi1234

            Thanks for this and the links

             

            Regards