Wireless Access

 View Only

  • 1.  DHCP option 43

    Posted Oct 22, 2024 09:56 AM

    Hi

    Customer has one WLC in each of their datacenters.
    To maximize bandwidth and have some redundancy, half of the AP's are connected to DC1, the other half to DC2, with LMS failover.

    As they are using DHCP options for AP's to discover the WLC, option 43, this discovery will point to WLC1 at the moment. As i understand, LMS is not stored in the AP config, thus the AP's will not be able to find any WLC if WLC1 is down and boots.
    Meaning if the AP's failover (apmove) to WLC2, and is booted, they will be down.

    Looks like the Windows dhcp server can push several IP's under option 43, but will the Aruba AP understand this?

    The 2 WLC's do not have any connection between each other, no HA etc. They just connect to a Mobility Master/Conducter in a different place for config etc.

    Any clever way to get around this?

    Roar 



    ------------------------------
    ------------------------------
    | ACMP | ACSP | ACCP | ACEP | ACNT |
    -Just your regular airhead-
    ------------------------------
    ------------------------------


  • 2.  RE: DHCP option 43

    Posted Oct 22, 2024 10:47 AM

    Where did you hear that the AP doesn't store the LMS?  LMS and B-LMS should both be stored in the AP's environment variables.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------



  • 3.  RE: DHCP option 43

    Posted Oct 23, 2024 01:58 AM

    Hi

    Well i read in this thread

    https://community.arubanetworks.com/discussion/lms-ip-question-and-what-is-stored-on-aps-config

    And i tend to listen when Colin speaks, but i will verify it my lab i guess

    Roar



    ------------------------------
    ------------------------------
    | ACMP | ACSP | ACCP | ACEP | ACNT |
    -Just your regular airhead-
    ------------------------------
    ------------------------------



  • 4.  RE: DHCP option 43

    Posted Oct 23, 2024 04:20 AM
    Edited by Mosher Oct 23, 2024 04:21 AM

    Hi

    Did a test in my lab and added a few LMS IP's to the AP system profile.

    Bootet the AP and stopped it at boot, and voila, 

    previous_lms=10.11.157.27
    cfg_lms=10.11.157.27
    num_total_bootstrap=8
    cfg_blms=10.11.157.254

    Looks like Colin was wrong on this one :D

    Roar



    ------------------------------
    ------------------------------
    | ACMP | ACSP | ACCP | ACEP | ACNT |
    -Just your regular airhead-
    ------------------------------
    ------------------------------



  • 5.  RE: DHCP option 43

    Posted Oct 23, 2024 10:05 AM

    His answer was from 2019, things have possibly changed since then.

    For instance, the AP discovery flow was changed with 8.4 and then tuned again in 8.5.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------

    Original Message


Related Content