Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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How calRelationship BSSID

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  • 1.  How calRelationship BSSID

    Posted Oct 28, 2016 01:04 AM

    Hi All

    What is the relationship of BSSID with the max number APs, max number SSID and max connected devices?

    How to calculate the maximum number of BSSID for Aruba Controller Mobility 7240 ( by datasheet 32768). 

     

    Thanks for your help



  • 2.  RE: How calRelationship BSSID
    Best Answer

    Posted Oct 28, 2016 05:29 AM

    Every SSID on every radio needs a BSSID. So if you have 8 SSIDs on a dual radio AP, you will have 16 BSSIDs. Think of it like a unique identifier for the SSIDs in the air per radio.

     

    On a controller, you can see them with the command: show ap bss-table:

    (Aruba7005-1) #show ap bss-table

    fm (forward mode): T-Tunnel, S-Split, D-Decrypt Tunnel, B-Bridge (s-standard, p-persistent, b-backup, a-always), n-anyspot

    Aruba AP BSS Table
    ------------------
    bss ess port ip phy type ch/EIRP/max-EIRP cur-cl ap name in-t(s) tot-t mtu acl-state acl fm
    --- --- ---- -- --- ---- ---------------- ------ ------- ------- ----- --- --------- --- --
    ac:a3:1e:d8:f1:f3 roaming N/A 192.168.31.140 a-VHT ap 40-/22/22 0 AP-215-BG-8f:1e 0 1d:18h:47m:17s 1500 - 2 T ac:a3:1e:d8:f1:f0 WLAN_WPA2 N/A 192.168.31.140 a-VHT ap 40-/22/22 2 AP-215-BG-8f:1e 0 1d:18h:47m:17s 1500 - 2 T ac:a3:1e:d8:f1:e0 WLAN_WPA2 N/A 192.168.31.140 g-HT ap 1/6/19 1 AP-215-BG-8f:1e 0 1d:18h:47m:17s 1500 - 2 T

    Most APs have a maximum of 16 BSSIDs per AP, that makes the calculation for a 7240: 2048 APs * 16 BSSID per AP = 32k.

     

    That means that in practice there is no limit on the controller on BSSID; not sure why it is listed in the datasheet anyway... You cannot exceed the number anyway...

     

    Don't be confused with maximum clients; this number has nothing to do with that. 

     

    As a remark, having 16 SSIDs on an AP will have terrible performance as the overhead of SSID broadcasts will take a very significant amount of Airtime. Try to keep SSIDs to 2 or 3 max (per radio), whenever possible.