15 Replies Latest reply on Nov 4, 2014 2:02 PM by matt

    configuring DHCP Server in a VRRP environment

    larryp New Member


      I have two 1335 configured with multiple VLANs operating in a VRRP environment.I would like to use these servers to preform the DHCP function.  How do I set up these servers so that they do not have a conflict?

        • Re: configuring DHCP Server in a VRRP environment
          levi Employee

          larryp:

           

          Will you have the same subnets/VLANs on each NetVanta 1335, and you would like both units to be DHCP servers for the same networks?  Or would you like 1335(a) to be the DHCP server for "subnet X" and 1335(b) to be the DHCP server for "subnet Y"?

           

          Levi

            • Re: configuring DHCP Server in a VRRP environment
              larryp New Member

              I wanted to make the two units complete duplicates. Both units would generate DHCP  for both subnets.

               

              See below

               

              Regards

               

              Larry Pomatto

              Director of Engineering

              Systems Integrated

               

              Message was edited by: levi (removed contact information)

                • Re: configuring DHCP Server in a VRRP environment
                  levi Employee

                  Larry:

                   

                  Unfortunately, there is not an easy way to configure both units as mirror images for DHCP in this application.  My suggestion is to have another device on the network be the DHCP server, have one unit be the DHCP server for everything, or have the DHCP subnets separated between the two 1335s. 

                   

                  Let me know what questions you have.

                   

                  Levi

                  1 of 1 people found this helpful
                    • Re: configuring DHCP Server in a VRRP environment
                      danb Visitor

                      Levi,

                      I had to do this once and it was advised that we run a TCL script to load the DHCP config into the backup 1335 when a probe/track determined that the master went down.  We never implemented this so I don't have any configs to share but this was discussed.  Looks like it would work here.  Thoughts?

                      Dan

                      1 of 1 people found this helpful
                        • Re: configuring DHCP Server in a VRRP environment
                          levi Employee

                          Dan:

                           

                          You are exactly correct!  As I alluded to above, that is the "hard" way to implement this solution.  Here are the Configuring TCL Scripting in AOS and Configuring Networking Monitoring in AOS guides for reference (Note:  ADTRAN Technical Support does not support TCL Scripting configurations).

                           

                          Levi

                            • Re: configuring DHCP Server in a VRRP environment
                              danb Visitor

                              But I like your idea of an "offline" DHCP server solution much better.  It's cleaner.

                              Dan

                                • Re: configuring DHCP Server in a VRRP environment
                                  larryp New Member

                                  Thanks for all of the input.

                                   

                                  Here is the real problem and I believe that this is not isolated.

                                   

                                  We develop redundant systems to insure that there are no single points of failure.

                                   

                                  While the idea of the a separate box for the DHCP solution is good… the result is that I have to put two of them.  My overall objective is to implement the network to support this requirement.  So far (with the exception of the DHCP) I have been successful. Your Idea of configuring a TCL script is a great way to accomplish my objective and I had not thought of it.  Now I need to figure out how to use TCL scripts to turn on / off different functionality (in this case DHCP server).  The document Configuring TCL scripts provides the fundamentals but it is not clear how to apply this to DHCP process.

                                   

                                   

                                   

                                  If you don’t mind, I will take a shot at a writing a script, test it and route it to you for comment.

                                   

                                  Regards

                                   

                                  Larry Pomatto

                                  Director of Engineering

                                  Systems Integrated

                                   

                                  Message was edited by: levi (removed contact information)

                      • Re: configuring DHCP Server in a VRRP environment
                        levi Employee

                        larryp:

                         

                        I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post and unmark it and select another in its place with the applicable buttons.  If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.

                         

                        Thanks,

                         

                        Levi

                          • Re: configuring DHCP Server in a VRRP environment
                            redbarron New Member

                            Instead of flagging this correct can we have this sent into engineering to be addressed.  I'm running this configuration on multiple sites without a TCL file, and although it causes some grief if the backup network stays on-line for to long it does function as is.  What we need is for ADTRAN to write a hook into VRRP for mirroring the DHCP leases between the two devices. 

                              • Re: configuring DHCP Server in a VRRP environment
                                levi Employee

                                redbarron:

                                 

                                If you would like to request the feature you mentioned for future implementation into ADTRAN OS, I recommend you contact your local ADTRAN Sales Representative and present the idea to them.

                                 

                                Levi

                                  • Re: configuring DHCP Server in a VRRP environment
                                    larryp New Member

                                    Sorry I didn’t get back to you earlier.  I haven’t had time to implement the script.  I have however solved the VPN use the low cost 3120 for remote access – I will sent it to you.

                                     

                                    I have the script done by the end of the year

                                    Regards

                                     

                                     

                                    Larry Pomatto

                                    Director of Engineering

                                    Systems Integrated

                                    2200 N. Glassell St.

                                    Orange, CA 92865

                                    cell (714) 323-1871, office (714) 998-0900 ext 4562

                                    • Re: configuring DHCP Server in a VRRP environment
                                      redbarron New Member

                                      Why don't ADTRAN monitor this forum for feature requests?  If they can't pick up on the need and put in there own feature requests they are doing something wrong.  Now if ADTRAN would like to pay me or give me additional discounts for venting their product and documenting its weaknesses or failures, then I might feel inclined to make such requests.  I will take this up with my ADTRAN SE and Sales Manager.

                                        • Re: configuring DHCP Server in a VRRP environment
                                          Employee

                                          redbarron - Thanks for your post.  ADTRAN does monitor the ADTRAN Support Community for feature requests related to our wireless LAN and UC offerings.  We have other more direct mechanisms for getting input on feature enhancements for our router and IP Business gateway families. If you have suggestions for those product areas, contacting your ADTRAN SE and/or Sales Manager is a good approach, as you suggested in your post.


                                          Thanks,

                                          Matt

                                  • Re: configuring DHCP Server in a VRRP environment
                                    yfl New Member

                                    Larry,

                                    If you are still out there.......

                                    Did you ever figure out how to use a TCL script in the switch?

                                    Not much has been added to the support forum in that regard.

                                    Any information you have would be greatly appreciated.

                                    Thanks,

                                     

                                    Jim