SNMP configuration is for whole device. Once its enabled properly it should give information of whole device. Following documents would be helpful.
Based on the SNMP software that you are using, you might have to specify SNMPv2 and community strings. These values are under "Options" section.
Also Layer 3 connectivity is important and make sure you don't have deny any any policy at the bottom from trust-2-trust traffic. Look for "show session " information for source IP of the machine that is doing snmp walk. Hope this helps.
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