Community string in SNMPv3

[ThomasD86]

Hi,

I am trying to configure SNMPv3 on ios-xr 7.9.21, and I am a bit confused about the role of the community string in SNMPv3, I thought that v3 had an user based model and that community_strings were a SNMP v1/2 concept but when I try to enter the server host with this CLI:
snmp-server host 10.20.30.40 informs version 3 priv [community_string]

XR expects me to define a community string.The SNMP manager (EPNM) doesn't even ask for itwhen adding the SNMPv3 credentials of the device so my best guess is that in this instance community_string equals the SNMPv3 username. Is this correct?

[balaji.bandi]

check different SNMP configuration on different IOS but most of them to be similar as example below from my notes :

snmp-server view ViewDefault iso included
snmp-server group GrpMonitoring v3 priv read ViewDefault
snmp-server user UserJustMe GrpMonitoring v3 auth sha AuthPass1 priv aes 128 PrivPass2

The SNMP manager (EPNM)  - never used by myself - but above config works with any snmp agent

[David Ruess]

Hello,

SNMPv3 uses the concept of Groups and Users. You are correct in that the String for v3 is the Community String for v1/2 or user for v3. This is also for backwards compatibility

-David