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Artikel-id: 000040464
Last Modified Date: 12/09/2021
Access Level: Public

VVX audio issue observed in network (Alcatel switch) with dot1x authentication enabled

Customer complain of VVX Audio drops in their newly setup environment. 802.1x authentication is enabled.
The missing audio happens in a fixed interval. No network packet loss was observed.
From VVX log, the following error was observed; 1112124122|dot1x|1|00|EAP: Received EAP-Success
1112124122|dot1x|1|00|EAP: EAP-Success Id mismatch - reqId=29 lastId=28
1112124122|dot1x|1|00|EAP: EAP entering state DISCARD
1112124122|dot1x|1|00|EAP: EAP entering state IDLE
1112124122|dot1x|1|00|EAPOL: SUPP_BE entering state RECEIVE
This is also confirmed on the packet trace for example;  VVX expected "Success" packet with id 102 instead it is receiving id 103.  As per RFC 3748, "success" MUST have the same identifier as the packet it is responding to. 
This is not VVX problem. Switch is not behaving as per standard. It is sending EAP success packet with wrong Identifier. 
Due to this, VVX attempted to re-authenticate every time and this causes the audio drop issue.