Hello,
Whatsup Gold supports SNMP v1-3.
If you use v1 or v2c, in order to get MIBs from a router or switch
only you need to configure are ip address and following line
in global configuration mode.
"snmp-server community "
If you need specific requirement other than just getting MIBs,
you can find information about snmp part in following urls.
You can easly find documents for your IOS version or for products from here.
http://www.cisco.com/univercd/home/home.htm
Select your IOS release and go "Configuration Guide and Command Reference",
then you can see "Network Management Configuration Guide" there.
e.g. "Network Management Configuration Guide" of IOS 12.4 is here.
Cisco IOS Network Management Configuration Guide, Release 12.4
Configuring SNMP Versions 1 and 2
http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_cfg_snmp_sup_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1200341
Cisco IOS Network Management Configuration Guide, Release 12.4
Configuring SNMP Version 3
http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_cfg_snmp_sup_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1201017
Regards,
Kimihito.