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HP V1910-48G switch ports of aggregation group become INACTIVE

 
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aa4
Occasional Visitor

HP V1910-48G switch ports of aggregation group become INACTIVE

On our V1910 switch we have observed intermittent network disconnections.

Based on the log file, the ports with the highest number of network disconnections (indicated with "link status is DOWN") were 4 ports (Ports 9, 30, 31, 32) that are members of a static aggregation group identified as BAGG9.
In the logfile, the following message is recorded for Port 9 (Similar messages appear for ports 30,31,32):
"Port member GigabitEthernet1/0/9 of aggregation group BAGG9 becomes INACTIVE, because the port's configuration is improper for aggregation."

We have checked our configuration and found that the 4 ports have the following settings:
•802.1X protocol is disabled
•Handshake is enabled
•Periodic reauthentication is disabled
•The port is an authenticator
•Authentication Mode is Auto
•Port Control Type is Mac-based
•802.1X Multicast-trigger is enabled
•Mandatory authentication domain: NOT configured
•Guest VLAN: NOT configured
•Auth-Fail VLAN: NOT configured
•Max number of on-line users is 256

Which of these settings is "improper for aggregation"?