RADIUS

Name

Acct-Link-Count

Synopsis

Attribute Number	51
Length	6
Value	INTEGER
Allowed in	Accounting-Request
Prohibited in	Accounting-Response
Presence in Packet	Not required
Maximum Iterations	Unlimited

This attribute indicates the number of current sessions in a multilink transaction. The way this value is determined is of particular interest. Let’s examine it more closely.

The value field simply shows the number of times links have been observed by the accounting server whose connections are using the same Acct-Multi-Session-ID. The following is a tabulation example of link counts. By using these link counts and enumerating each Accounting Stop packet received, the accounting server can determine when its recordkeeping is complete for any given multilink session:

Multi-Session-ID   Session-ID   Status-Type   Link-Count
52                 21           Start         1
52                 22           Start         2
52                 23           Start         3
52                 22           Stop          3
52                 21           Stop          3
52                 24           Start         4
52                 23           Stop          4
52                 22           Stop          4