Allied Telesis AT-S63 - Manual (Page 82)

Chapter 4: SNMPv1 and SNMPv2 Community Strings
82 Section I: Basic Operations
It does not matter which community strings you assign your trap
receivers. When the switch sends a trap, it looks at all the community
strings and sends the trap to all trap receivers on all community strings.
This is true even for community strings that have a access mode of only
Read.
If you are not interested in receiving traps, then you do not need to enter
any IP addresses of trap receivers.
Default SNMP
Community
Strings
The AT-S63 management software provides two default community
strings: public and private. The public string has an access mode of just
Read and the private string has an access mode of Read/Write. If you
activate SNMP management on the switch, you should delete or disable
the private community string, which is a standard community string in
the industry, or change its status from open to closed to prevent
unauthorized changes to the switch.