Allied Telesis AT-S63 - Manual (Page 73)

AT-S63 Management Software Features Guide
Section I: Basic Operations 73
the community strings.
Each community string can have up to eight trap IP addresses.
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.