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cable submgmt default
The DOCS-SUBMGT-MIB MIB contains its own default values for these attributes, and those defaults
Timesaver
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.
CPE Management
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.
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cable submgmt default learnable
Sets the docsSubMgtCpeLearnableDefault attribute, which is the default value for the
docsSubMgtCpeControlLearnable attribute in docsSubMgtCpeControlTable. This attribute controls
whether the CMTS learns the IP addresses for CPE devices behind a particular CM.
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cable submgmt default max-cpe cpe-num
Sets the docsSubMgtCpeMaxIpDefault attribute, which specifies the default value for the
docsSubMgtCpeControlMaxCpeIp attribute in docsSubMgtCpeControlTable. This attribute specifies
the maximum number of IP addresses that can transmit traffic through a particular CM. The possible
range is 0 to 1024, and the original default is 16.
Note The MAX-CPE attribute is used only when the CMTS is actively managing CPE devices for the CM.
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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.
The no cable submgmt default active command sets the default to FALSE (the default value),
which specifies that the CMTS is not to perform CPE management for the particular CM.
The cable submgmt default learnable command sets the default to TRUE (the default value),
which specifies that the CMTS is to learn the IP addresses for the CPE devices behind the CM, up
to the value specified by the MAX-CPE parameter. The CMTS learns the IP addresses by monitoring
the traffic sent by the CPE devices, and the first CPE devices to transmit traffic are the first CPE
devices to be learned.
The no cable submgmt default learnable command sets the default to FALSE, which specifies that
the CMTS does not learn the IP addresses for the CPE devices behind a particular CM. Instead, the IP
addresses for each CM that is to be allowed access must be specified in the DOCSIS configuration file.
Chapter 2 Cisco CMTS Configuration Commands
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