Reuse/uniqueness of BSSIDs in 802.11

[Felix Baumann]

Am 22. September 2025 02:30:00 MESZ schrieb Elliott Mitchell <ehem+openwrt at m5p.com>:
>There is an odd issue which comes up with DBDC cards.  What are 802.11's
>requirements for uniqueness/reuse of BSSIDs?
>
>Can a DBDC chip with 2 radios reuse its BSSIDs on each radio?
>
>I would suspect so, though there could be limitations.  I would think it
>legal if both radios were on different bands.  Perhaps it would be
>required for the BSSID to be paired with the same SSID on each radio.
>
>In a different way you can think of tuples:
>
><bssid, ssid, chan, band>
>
>Is <bssid0, chan0> sufficiently distinct from <bssid0, chan1>?  Does
>this pair require the same SSID for both?
>
>Is <bssid0, band0> sufficiently distinct from <bssid0, band1>?  Does
>this pair require the same SSID for both?
>
>The rules for radio/802.11 are different from ethernet.  Issue #995 on
>GitHub needs an expert who can speak to the actual rules/limitations.
>

Hi,

you forgot to post a link to the issue you mentioned:
<https://github.com/openwrt/mt76/issues/995>

People would look here which is entirely unrelated:
<https://github.com/openwrt/openwrt/pull/995> 

Regards
Felix Baumann