---
title: "Interface Variables"
canonical: "https://docs.infoblox.com/space/netmri754/105944165/Interface%20Variables"
format: markdown
---
The following variables are defined for interfaces and supported in Interface Group criteria expressions:

`$ifIndex` unique SNMP numeric index for the interface  
`$ifDescr` interface description defined by user  
`$ifName` interface name  
`$ifType` interface type defined by SNMP  
`$ifMtu` interface MTU  
`$ifPhysAddress` interface MAC address (if any)  
`$ifSpeed` interface speed  
`$ifAdminStatus` interface administrative status ("up"/"down")  
`$ifOperStatus` interface operational status ("up"/"down")  
`$ifTrunkStatus` interface trunk status ("on"/"off")  
`$Network` returns the name of the network view to which the interface IP address belongs.