ExtremeWireless (WiNG)

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Level 2 MiNT Links - Single AP importance

  • 1.  Level 2 MiNT Links - Single AP importance

    Posted 08-25-2018 14:36
    Hello,

    I have a question regarding Level 2 Links.

    I noticed that when Level 2's adoption mode is activated, only one Access Point appears in each RF-Domain.

    This single Access Point Access Point adopted, in the case by the VX9000, does something "different"? For example, if I have an adopted Access Point generating Crash Log, can it mess up the entire RF-domain, causing disconnects or something like that?

    Thanks in advance.



  • 2.  RE: Level 2 MiNT Links - Single AP importance

    Posted 08-25-2018 19:24
    I'm not entirely sure by what you mean when you say "only one Access Point appears in each RF-Domain" but when you have a Distributed deployment (controller in NOC and APs in remote sites) you should be using Level-2 MiNT links between each site (RF-Domain) and the controller.

    At each RF-Domain, one of the APs will be automatically elected as the RF-Domain manager and will retain its level-2 MiNT link with the controller. All of the other non-RF-Domain manager APs at the site (RF-Domain) will drop their initial existing level-2 links with the controller and then just establish level-1 MiNT links with all the other APs within the RF-Domain (including whichever AP is the acting RF-Domain manager. From that point forward, stats and other communications between the controller and the site's APs are effectively 'proxied' through the RF-Domain manager AP. All of this is automatic.

    The elected RF-Domain manager still behaves as an AP...but it also takes on some additional responsibilities. Examples would be collection of RF-stats from the other APs within the same RF-Domain, which it then uses to make decisions about channel/power planning and will tell the other APs what power/channel to use (if using SmartRF).
    Another extra responsibility would be the distribution of firmware. When the controller tells a site (RF-Domain) to upgrade its firmware, the controller pushes out only 1 copy of the image to the RF-Domain manager AP at each site (RF-Domain). The RF-Domain manager will then distribute the image to the other APs within the RF-Domain...and then finally will upgrade itself.

    In the event that the currently elected RF-Domain manager AP goes down (for whatever reason) another election will automatically take place, and another AP takes over.

    As far as an adopted AP generating a crash log messing up the entire RF-Domain? Nope.


  • 3.  RE: Level 2 MiNT Links - Single AP importance

    Posted 08-28-2018 11:21
    Its possible you do not have a control vlan correctly configured on your rf-domain.
    If that is properly configured please ensure that all your APs at the site see each other as mint-neighbors on the control vlan you selected.


  • 4.  RE: Level 2 MiNT Links - Single AP importance

    Posted 08-28-2018 13:38
    Ahh..Thanks, Daren. I think I understand what Richard is seeing now.

    ...and in that case, based on experience, if you don't have a defined Control-VLAN (or if the APs cannot establish their MiNT level-1 links between each other for whatever reason), then what you'll see in each RF-Domain is just 1 AP. (Reason for this below)

    If the APs that exist within an RF-Domain can't 'see' each other on the network, then every AP in that RF-Domain thinks that they are the ONLY 1 AP in the RF-Domain, right?...and as such, they elect themselves as the RF-Domain manager...because they think they're the only one there!
    This ends up leading to the issue you're seeing in the UI. If memory serves, you will also likely see that the 1 AP that shows up in the RF-Domain will change periodically (to a different AP).

    Bottom line, as Daren said, confirm you have the control-vlan setup properly. After that, confirm that all of the AP within the RF-Domain can see each other via MiNT level-1 links.
    On the controller, issue command on the CLI:

    #show mint links on


  • 5.  RE: Level 2 MiNT Links - Single AP importance

    Posted 09-08-2018 11:52
    Chris Kelly and Daren Ellis,

    Many many many thanks for this explanation! You gave us a real class!

    Solved my problem!

    Control VLAN on Remote Sites is required. In my case i use dedicated VLAN for L2 Comm between APs in remote sites. Just some clicks solved.

    Examples:






  • 6.  RE: Level 2 MiNT Links - Single AP importance

    Posted 09-08-2018 13:06
    Nice work, Richard! Looking good now!


  • 7.  RE: Level 2 MiNT Links - Single AP importance

    Posted 03-07-2019 12:48
    I understand that when you have an access point acting as the RF domain manager (not a virtual controller!) then the maximum number of APs in the managed RF domain is limited. With an old AP, e.g. AP650, this may be 64 APs. With the AP8232 it may be 128 APs. We have both of these, and a number of other models, in our network.

    Is there a list available of the RF domain management capabilities of each access point model?