Technical information

ADC Telecommunications, Inc.
610 C
HAPTER 21: CONFIGURING SUBSCRIBER MANAGEMENT
3. During initialization, the cable modem is assigned a Subscriber
Management filter group from the provisioning server. (For information
about Subscriber Management configuration on the provisioning server,
refer to the FastFlow Broadband Provisioning Manager Guide, or
the guide for your external provisioning manager vendor.)
4. If Subscriber Management filter groups do not exist on the provisioning
server, the cable modem is assigned a default filter group on the Cuda
12000.
5. If the network administrator chooses not to use the criteria of the global
filter group for a particular cable modem, the administrator may modify
the global filter group. Modifications to filter groups on a per cable
modem basis are temporary assignments and available only for the
current session. The modifications do not persist, so the original filter
group is not overwritten.
How Filtering Works
The IP packet filtering system and Subscriber Management filter operate in
serial. The packet is dropped if either filter denies the packet; for example:
■ If your network is configured to use both the IP packet and Subscriber
Management filters, the packet is first filtered through the IP packet
matching criteria.
■ If the IP packet denies the packet, the packet is dropped and is not
forwarded.
■ If the packet is accepted by the IP packet, the packet is filtered through
the Subscriber Management filter.
■ If the Subscriber Management filter denies the packet, the packet is
dropped.
■ If the packet is accepted by the Subscriber Management filter, the packet
is forwarded.
For detailed information on IP packet filters, refer to Chapter 14, “IP Packet
Filtering”.