radius persist irule with multiple vendor specific attributes

Hello,

Interesting question - I didn't realize that some vendors reuse the same sub-type for different VSAs. How inconvenient!

It sounds like you need to loop through values at each index until you find the one you want to persist on. Yes, it will be somewhat costly in terms of performance. Something like this:

when CLIENT_DATA {
    set i 0
    set val [RADIUS::avp 26 "string" index 0 vendor-id 9 vendor-type 1]
    while { $val ne "" } {
        log local0. "AVP at index $i has value $val"

        if {  } {
            persist uie $val
            set val ""
        } else {
            incr i
            set val [RADIUS::avp 26 "string" index $i vendor-id 9 vendor-type 1]
        }
    }    
}

I found this table which I assume you've been using for reference. Unfortunately, that table doesn't specify possible values for each attribute nor length, nor how these values are encoded.

The tricky part is determining if this is the correct AVP just by looking at the value. That was the intention of Vendor Sub-type, but since some vendors don't follow that standard, you'll have to think of a clever way to figure this out.

Hope this helps!