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NetworkFreelancer's avatar
Feb 10, 2025
Solved

New to the community

Hello all,

I am a Network & Security Freelancer by profession. I look after providing solutions for Firewalls, Routing/Switching and network design and implementation in general.

 

Recently, I have started exploring BigIP F5 Load Balancers. Mostly I am trying to get hand on it via LAB practice using trial licenses. While exploring the BigIP LB, I came across this DevCentral community and so I am here :) .

So it looks, my questions or queries posted here will be answered or solved.

 

Today, I am looking for the help on iRules and LTM policy.

What are the differences?

What will be uses cases of both?

Any advantages of one on other?

 

Looking for the answers.

 

 

 

  • Hi NetworkFreelancer 

     

    First of all, welcome to the Community!


    If you are exploring the BigIP F5 products and you are having questions/queries to be asked then, YOU ARE AT RIGHT PLACE..

    Here are my inputs to your questions -

    What are the differences?


    -The key difference is the order of execution. LTM policy takes precedence over iRule in the execution sequence.
    -With LTM policy, it will have less overhead for traffic processing when compare to iRule handling the same execution.
    -iRule is still relevant as it will be used for some specific requirement/s which are not flexible with LTM policies.

     

    What will be uses cases of both?


    -LTM policies comes with different use cases like, redirects, forward, matching some specific condition based on GEO IP, etc.
    -iRule can be created to perform similar executions which are done by LTM policies. But apart from this, iRule becomes more relevant when we have some complex use cases/needs. 


    Any advantages of one on other?


    Each one has its own advantages.

    LTM Policy -
    -Less performance overhead while processing the traffic
    -Take priority over iRule
    -Easy to configure and manage

    iRules - 
    -Useful for more complex and custom requirements.
    -Comes with more flexible options.

     

    You can also refer this article for more information.

     

    Hope it helps!

    Let us know when you test your first iRule and a LTM policy in your LAB setup.

  • Hi NetworkFreelancer 

     

    First of all, welcome to the Community!


    If you are exploring the BigIP F5 products and you are having questions/queries to be asked then, YOU ARE AT RIGHT PLACE..

    Here are my inputs to your questions -

    What are the differences?


    -The key difference is the order of execution. LTM policy takes precedence over iRule in the execution sequence.
    -With LTM policy, it will have less overhead for traffic processing when compare to iRule handling the same execution.
    -iRule is still relevant as it will be used for some specific requirement/s which are not flexible with LTM policies.

     

    What will be uses cases of both?


    -LTM policies comes with different use cases like, redirects, forward, matching some specific condition based on GEO IP, etc.
    -iRule can be created to perform similar executions which are done by LTM policies. But apart from this, iRule becomes more relevant when we have some complex use cases/needs. 


    Any advantages of one on other?


    Each one has its own advantages.

    LTM Policy -
    -Less performance overhead while processing the traffic
    -Take priority over iRule
    -Easy to configure and manage

    iRules - 
    -Useful for more complex and custom requirements.
    -Comes with more flexible options.

     

    You can also refer this article for more information.

     

    Hope it helps!

    Let us know when you test your first iRule and a LTM policy in your LAB setup.

  • Hi NetworkFreelancer I am glad to know that it helped you.

    Could you please mark my post as accepted solution if it solved your query?

     

    If you get any other query/question in future, feel free to create new conversation. Thanks!

     

    Cheers!

    M

     

    • NetworkFreelancer's avatar
      NetworkFreelancer
      Icon for Altocumulus rankAltocumulus

      Sure thing.

      Thank you for updating me with this option. As a newbie on the community, I am still trying to explore and understand the different options here.