Subscribers are managed by the router through the use of subscriber identification strings. A subscriber identification string uniquely identifies a subscriber.
The subscriber identification string is the index key to any entry in the active subscriber table, and therefore must always be available. It is derived as follows:
For dynamic hosts, the subscriber identification string is derived from the DHCP ACK message sent to the subscriber host.
The DHCP ACK message is processed by a subscriber identification script which has the capability to parse the message into an alternative ASCII string value.
If enhanced subscriber management is disabled, the default value for the string is the content of the Option 82 circuit-id and remote-id fields interpreted as an octet string.
For static hosts, the subscriber identification string must be explicitly defined with each static subscriber host.
When multiple hosts are associated with the same subscriber identification string, they are considered to be host members of the same subscriber. Hosts from multiple SAPs can be members of the same subscriber, but for correct virtual scheduling to be performed all hosts of a subscriber must be active on the same IOM.
When the first host (either dynamic or static) is created with a specific subscriber identification string, an entry is created in the active subscriber table. The entries are grouped by their subscriber identification string.