1. Remove and re-add the switch using the IP which it uses to sends the trap/informs and reconfigure the trap receiver from Extreme Management Center.
Netsight: How to configure a summit switch to send a SNMP v3 trap to Netsight, and have Netsight correctly log the trap for that switch
2. Modify the switch config to send the traps/inform using the loopback IP address.
configure snmpv3 add target-addr "Trap receiver" param "Trap_Username" ipaddress <XMC IP> from <LoopbackIP of the switch> vr vr-default