I used the following website to enable snmpv3 on my cisco router:
I used to following line to create the snmp user
âsnmp-server user username readonly v3 auth md5 mysecretpass priv des56 passphraseâ
After this snmpv3 works well. But when I do a show run I don't see this config line of the snmp user anywhere. More troubling, the snmp user is gone after a reload of the router and I have to re-enter it.
I'm using a Cisco 1605R router with c1600-k8osy-mz.123-22.bin