Cisco Broadband Cable Command Reference Guide

Chapter 2 Cisco Cable Modem Termination System Commands
Command Modes Global configuration
Command History
OL-1581-05
Cisco Broadband Cable Command Reference Guide
cable submgmt default
The active parameter defaults to FALSE (the CMTS does not actively manage CPE devices).
The learnable parameter defaults to TRUE (the CMTS learns the IP addresses for CPE devices).
The max-cpe parameter defaults to 16 IP addresses.
The filter group ID for each type of filter group defaults to 0, which means that no filtering is done
on that type of traffic.
Usage Guidelines The DOCSIS 1.1 Subscriber Management MIB (DOCS-SUBMGT-MIB) creates and maintains a number
of tables that describe the state of subscriber management for the CMs and CPE devices being serviced
by the Cisco CMTS. The CMTS creates rows in these tables for each CM and CPE device when the CM
registers with the CMTS, and if the CM does not specify a value for an attribute in this table, the CMTS
uses the defaults specified by the cable submgmt default command.
CPE Management
Release Modification
12.1(7)CX1 This command was introduced.
Timesaver The DOCS-SUBMGT-MIB MIB contains its own default values for these attributes, and those defaults
can be overridden by giving the appropriate SNMP SET commands. The cable submgmt default
command, however, allows the new defaults to be included in the Cisco IOS configuration file so that
the defaults are automatically reconfigured whenever the CMTS reboots or reloads.
Note The cable submgmt default command sets only the default value for these attributes. These default
values are used only if the CM does not specify other values when it registers with the CMTS. If the CM
does specify different values at registration time, those values are used instead of these default values.
The attributes in DOCS-SUBMGT-MIB control how the CMTS manages the CPE devices behind a CM
and the filters that are applied to the traffic to and from a particular CM and its CPE devices. The
following sections describe the relationship between the different forms of the cable submgmt default
commands and the attributes in DOCS-SUBMGT-MIB.
The first form of the cable submgmt default command controls the default values for the entries in the
docsSubMgtCpeControlTable, which controls how the CMTS manages the CPE devices for each CM:
cable submgmt default active
Sets the docsSubMgtCpeActiveDefault attribute, which is the default value for the
docsSubMgtCpeControlActive attribute in docsSubMgtCpeControlTable. This attribute controls
whether the CMTS performs CPE management for a particular CM.
The cable submgmt default active command sets the default to TRUE, which specifies that the
CMTS is to manage CPE devices by enforcing the MAX-CPE number and the implemented filters.
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