Used to provision the format of the circuit ID string. This string is returned by the PPPoE intermediate agent and DHCP relay agent in v4 sub option 1 or in v6 option 18. TR-101 states that the format of the circuit ID should be user defineable. The string may contain both fixed static string elements specified by the user and also variable and fixed length elements which are populated by the network element. Variable length elements are specified by enclosing the names of the variables with a dollar sign '$'. For instance, a user could specify a circuit id string as follows: 'TA1148-$accessnodeid$ Port: $port$ $vpi$/$vci$' which would expand to 'TA1148-TID Port: 1 0/35'. In this implementation, the access-node-id is equivalent to the system's provisioned TID or SNMP sysName. If this string is provisioned zero-length, then the default format is used. The total length of the expanded string MUST NOT exceed 63 characters. Variables include (but are not limited to) the following: Variable Name Character Length accessnodeid Varies chassis-id Varies shelf 2 slot 3 port 3 vpi 4 vci 5 q-vid 4 pbits 1 If a user defined circuit ID is not desired, this object can be set to simply 'default' and the default format described in TR-101 will be used: access-node-id atm slot/port:vpi.vci or access-node-id eth slot/port[:vlan-id]