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SNMP Auth Failures with SNMPv3 Configured

Hello,

 

We have SNMPv3 configured on our switches and we are still getting SNMP Auth failure syslogs and traps from devices making SNMPv2c requests using the default public community string. I do have a standard ACL configured with our known NMS servers applied to both the SNMP group and the user. After reading community posts, documentation and other online resources regarding setting up and configuring SNMPv3 I guess I was under the impression that our switches would not listen for v1 or v2c requests, but maybe I misunderstood.

 

To get these Auth Failures to stop popping up in our NMS is there a way to have our switches not listen for v1 or v2c requests or would I have to apply an ACL on the interface to drop SNMP packets not coming from our NMS servers? Also, our NMS is polling the IP addresses assigned to our VLAN ints on our switches. If I need to use an interface ACL would we apply this to our VLAN int inbound or inbound on the physical uplink port to our core?

 

Thank you!

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