Troubleshooting Tip: SNMP Walk Not Pulling Information About Certain Interface.

[slovepreet]

Description	This article describes how to resolve the issue of when the SNMP walk does not pull information about certain interfaces.
Scope	All supported versions of FortiOS.
Solution	FortiGate assigns a unique SNMP index to each interface for SNMP monitoring. In unlikely events that may arise from the configuration converted from another vendor or for some other reason, if two or more interfaces share the same SNMP index, SNMP tools may not be able to distinguish between them, leading to incomplete or missing data. For instance: config system interface     edit "wan1"         set vdom "root"         set ip 192.168.2.150 255.255.255.0         set type physical         set explicit-web-proxy enable         set alias "wan"         set role wan         set snmp-index 1 <----- Duplicate SNMP index.     next     edit "dmz"         set vdom "root"         set ip 192.168.3.1 255.255.255.0         set type physical         set snmp-index 1 <----- Same SNMP index as wan1.     next end Result: Solution: To resolve this issue, assign a unique SNMP index to each interface. Modify the SNMP index of one of the conflicting interfaces as shown below: config system interface     edit "dmz"         set snmp-index 2     next end After applying this change, SNMP walk operations should correctly retrieve data for all interfaces.