it does already have that basic config with "public" you described.
one thing which concerns me and it may be why SNMP packets are not returning to my polling.
when you trace route to the switch's IP it includes an extra hop from the same IP. i'm thinking SNMP does not know the return path if it is going through two interfaces or switches in that stack.
for instance - here's an example of a trace route (IP addresses changed but you get the picture)
1 <1 ms <1 ms <1 ms 10.25.110.1
2 * <1 ms <1 ms 10.179.50.33
3 18 ms 5 ms 1 ms mpls1.net
4 11 ms 14 ms 19 ms mpls2.net
5 11 ms 13 ms 14 ms mpls3.net
6 * * * Request timed out.
7 * * * Request timed out.
8 11 ms 14 ms 18 ms mpls4.net
9 22 ms 16 ms 14 ms mpls5.net
10 * 53 ms * Cisco3750Stack [10.15.15.243]
11 52 ms 52 ms 52 ms Cisco3750Stack [10.15.15.243]
