When you use a NetFlow collector (see
NetFlow Monitoring) or SNMP manager (see
SNMP Monitoring and Traps) to monitor the Palo Alto Networks firewall, an interface index (SNMP ifindex object) identifies the interface that carried a particular flow (see
Figure: Interface Indexes in an SNMP Manager). In contrast, the firewall web interface uses interface names as identifiers (for example, ethernet1/1), not indexes. To understand which statistics that you see in a NetFlow collector or SNMP manager apply to which firewall interface, you must be able to match the interface indexes with interface names.