communityName 1.3.6.1.4.1.838.1.2.1.2

This is the community name for SNMPv1/v2 requests, or the user name for SNMPv3 requests. For SNMPv1/v2 access using the cli, the username/password combination specifies the community string. When interpreted for SNMPv3, only the username portion of the string is used. Received snmp pdus determine a match with a table entry if the username/community name matches, AND the IP Address match is sufficient. See the ip address below, and the network mask. Although it is not prohibited, named entries in the table should not overlap. During authentication, the first 'active' communityName match will be used. Name overlap is only allowed since it may be desirable in some environments to have some name overlap while taking advantage of the notInService row status.