iRule to extract Radius Vendor Specific Attribute

Take a look at https://clouddocs.f5.com/api/irules/RADIUS__avp.html

an example irule would be:

when CLIENT_DATA {
    set deviceName [RADIUS::avp 26 'string' index 0 vendor-id 9 vendor-type 128]
}

In the case above, I am not sure about the vendor ID and vendor-type but you can find that from tcpdump