After an AP is upgraded from the old version (W1B4) to RGOS11.9(6)W3B1, Windows 7 devices using legacy NICs can no longer detect the SSID broadcast by the AP. However, other PCs and mobile phones can detect and connect to the SSID. Involved NICs:
RealtekRTL8723AE
RealtekRTL8723BE 2. Device Model and Firmware
Device Type
Device Model
Firmware Version
Ruijie wireless
AP820-L V2
RGOS11.9(6)W3B1
3. Cause Analysis
The NICs on Windows 7devices cannot parse the A-MSDU field in the new firmware version, which prevents them from recognizing beacon frames with Extended Capabilities(including the MSDU field) that exceed 8 bytes.
The left figure shows an A-MSDU value of 0 in the W1B4 version, while the right figure shows an A-MSDU value of 3 in the W3B1 version.
4. Solution
Change the amsdu-depth value to 0.
If the AP works in Fit mode, run the following commands on the AC:
ap-config xxx---xxx is all or the AP's name amsdu-depth 0 radio
end
wr
If the AP works in Fat or Cloud mode, run thefollowing commands on the AP:
int dot 1/0
amsdu-depth 0
Int dot 2/0
amsdu-depth 0
end
wr
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