In order to use Cisco switches with the Managed Switch Port Mapping tool, you need to have at least SNMPv1 or v2c running. You can do this with one line in the running-config.
1. from CLI, type enable followed by enter. You may need to enter a password.
2. switch# config term
3. switch(config)# snmp-server community public ro
^this makes it read only with the community name public, you can add rw at the end for read/write. You can use any community name that makes better sense, but remember that SNMPv1 and SNMPv2c are plaintext packets meaning they can be captured and read in Wireshark or any packet capture tool.
4. switch(config)# end or use CTRL-Z
5. switch# write memory
You should be able to map the switch immediately.