SNMPv1 uses community strings to limit access rights. Each SNMP device is assigned to a read community and a write community. To communicate with a device, you must send an SNMP packet with the relevant community name.
By default, if you communicate with a device using only the read community, you are assigned the security name ReadCommN. This security name is mapped to the ReadCommG group by default. This allows you to view the agent’s MIB tree, but you cannot change any of the values in the MIB tree.
If you communicate with a device using the write community, you are assigned the security name WriteCommN. This security name is mapped to the WriteCommG group by default. This allows you to view the agent’s MIB tree and change any of the values in the MIB tree.
Note:
If you delete the ReadCommN or WriteCommN users, the ReadCommG or WriteCommG groups, or the snmpv1WriteView or snmpv1View, you may not be able to access the device using SNMPv1 or SNMPv2c.
In addition, traps are sent to designated trap receivers. Packets with trap information also contain a trap community string.
