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New Contributor III

configuring DHCP Server in a VRRP environment

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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?

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New Contributor III

Re: configuring DHCP Server in a VRRP environment

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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)

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Anonymous
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Re: configuring DHCP Server in a VRRP environment

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:

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

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New Contributor III

Re: configuring DHCP Server in a VRRP environment

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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)

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Anonymous
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Re: configuring DHCP Server in a VRRP environment

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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

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Re: configuring DHCP Server in a VRRP environment

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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

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Anonymous
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Re: configuring DHCP Server in a VRRP environment

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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

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Re: configuring DHCP Server in a VRRP environment

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

Dan

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New Contributor III

Re: configuring DHCP Server in a VRRP environment

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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)

View solution in original post

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Anonymous
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Re: configuring DHCP Server in a VRRP environment

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Larry:

Feel free to post your TCL script here for other support community members to review.  ADTRAN does not provide troubleshooting or configuration assistance for TCL scripts.  I suggest reviewing the Configuring TCL Scripting in AOS guide or searching the web for TCL scripting examples and instructions.

Levi

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Anonymous
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Re: configuring DHCP Server in a VRRP environment

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:

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

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