Changing community strings
If you have Read-Write-All access authority, you can modify the SNMP community strings for access to the device through Device Manager. To change SNMP community strings, choose Edit > Security > SNMP. The table lists the meanings of the fields in the SNMP tab.
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ReadWriteAll
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When an SNMP message is received, the community string in the message is compared with this string first. If it matches, Read-Write access is granted to all items in the MIB. If it does not match, the ReadWrite string is compared next.
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ReadWrite
ReadWriteLayer3
ReadWriteLayer2
ReadWriteLayer1
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When an SNMP message is received, the community string in the message is compared with these strings second, third, and fourth, respectively. If it matches, Read-Write access is granted to the appropriate items in the MIB except community strings. (Community strings appear empty when read and return a noSuchName error when an attempt is made to write them.) If it does not match, the ReadOnly string is compared next.
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ReadOnly
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When an SNMP message is received by this entity, the community string in the message is compared with this string fifth. If it matches, Read-Only access is granted to all items in the MIB except community strings. (Community strings appear empty when read.) If it does not match, no access is granted, no response is sent back to the SNMP requester, and SNMP traps are sent to the SNMP trap receivers if configured.
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