11 Replies Latest reply on Jul 10, 2014 1:27 PM by noor

    connecting a 3120 to a 3430

    dlazure New Member


      Hi

       

      note this is for a test in lab

       

      I am trying to connect a network for a phone system to a network for the Data lan. We are installing a  IP phone system and need access to the data lan for applications.

      we need to provide a router to route both networks. we Can't use there router.

       

      the Phone Network is 172.16.0.0/24

      the Data Lan is 192.168.15.0/24

       

      in a 3120 I created two Vlan's

       

      Vlan 2 : 192.168.15.235/24

      Vlan 3 : 172.16.0.1/24

       

      the gateway of the data Lan is 192.168.15.1 on a Adtran 3430.

       

      I connected a port of the data Lan switch to the Vlan 2 of the 3120.

      I connected the phone system Lan to the Vlan 3 of the 3120.

       

      I routed intervlan between them.

       

      As soon as I connect the Data Lan into the 3120 we loose internet connection in the office on the 3430.

       

      why?

        • Re: connecting a 3120 to a 3430
          jayh Hall_of_Fame

          On your 3120 do you have anything configured for 192.168.15.1?  Is it supplying DHCP to the 192.168.15.0/24 subnet?  (Both should be "no".)

           

          Make sure that the 3120 port that connects to their existing data switch is an access port on VLAN 2 only, not a trunk.

           

          On a data workstation look at its routing table and its ARP table both before and during the failure.  One or both will likely show a change which should be a clue.

           

          You will need to add one line to their existing 3430 router configuration, but not having it shouldn't break their existing Internet connectivity.  Add:

           

          ip route 172.16.0.0 255.255.255.0 192.168.15.235

            • Re: connecting a 3120 to a 3430
              dlazure New Member

              No dhcp no 192.168.15.1 anywhere.

               

              The route table and arp table from a pc are the same before or after the failure

               

              Dominic lazure

              Luminet solutions

              514-908-2001

              1866-780-2022

               

               

               

              Le Jun 6, 2014 à 2:29 PM, jayh <adtran@adtran.hosted.jivesoftware.com> a écrit :

               

               

              ADTRAN Support Community

              connecting a 3120 to a 3430

              created by jayh in NetVanta 3400 Series - View the full discussion

              On your 3120 do you have anything configured for 192.168.15.1?  Is it supplying DHCP to the 192.168.15.0/24 subnet?  (Both should be "no".)

               

               

               

              Make sure that the 3120 port that connects to their existing data switch is an access port on VLAN 2 only, not a trunk.

               

               

               

              On a data workstation look at its routing table and its ARP table both before and during the failure.  One or both will likely show a change which should be a clue.

               

               

               

              You will need to add one line to their existing 3430 router configuration, but not having it shouldn't break their existing Internet connectivity.  Add:

               

               

               

              ip route 172.16.0.0 255.255.255.0 192.168.15.235

               

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              Reply to this message by replying to this email -or- go to the message on ADTRAN Support Community

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                • Re: connecting a 3120 to a 3430
                  jayh Hall_of_Fame

                  dlazure wrote:

                   

                  No dhcp no 192.168.15.1 anywhere.

                   

                  The route table and arp table from a pc are the same before or after the failure

                   

                  Then you'll need to investigate why the Internet to the existing data network fails when the 3120 is connected.  It should not make a difference other than perhaps temporarily when spanning-tree runs.  Look at policy sessions on the 3430, try traceroutes, pinging both inside and outside gateway, etc.  If all else fails, post configurations for both the 3120 and 3430 and note which ports tie them together.