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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter 1 Overview of Cisco uBR7200 Series Software
Supported Software Features for the Cisco uBR7200 Series
For additional information about this and other commands, refer to the following document on
Cisco.com:
• Cisco IOS CMTS Cable Command Reference Guide
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html
cable submgmt default
To enable the Cisco CMTS Static CPE Override feature on the Cisco CMTS, use the cable submgmt
default command in global configuration mode. This command enables field technicians to add a
temporary CPE device behind the subscriber’s cable modem. The temporary CPE device shares the same
SID settings as the original CPE device, even though the temporary CPE device has a different MAC
address. The original CPE device automatically changes from dhcp cpe to static cpe in the CMTS host
routing tables, and the CPE device continues to receive service with the same SID. To disable Cisco
CMTS Static CPE Override on the Cisco CMTS, use the no form of this command. This automatically
updates the routing tables and enables the MAC address from the technician’s laptop for a future field
service connection at a different location.
cable submgmt default {active | filter-group {cm | cpe} | learnable | max-cpe}
no cable submgmt default
Syntax Description
12.2(15)BC2 Support for verifying CMs and CPE devices that are on a different subnet
than the cable interface was enhanced to use Reverse Path Forwarding
(RFP).
12.3(9a)BC In order to protect the Cisco CMTS from denial of service attacks, Cisco IOS
Release 12.3(9a)BC adds the option of using a per SID basis for deriving
lease queries from CPE devices. This release also introduces a global rate
limit for lease queries initiated by downstream traffic. These enhancements
reduce the CPU utilization of DHCP Receive and ISR processes when the
Cisco CMTS is configured with the cable source-verify dhcp and no cable
arp commands.
Release Modification
active Keyword enables Cisco CMTS Static CPE Override, granting local CPE
control for subscriber management filtering (as defined by existing SID
settings).
filter-group {cm | cpe} Keyword enables one ore more temporary CPE devices to inherit the
characteristics of an existing filter group, either on the downstream or the
upstream of the cable modem (cm) or the CPE device (cpe).
• filter-group cm {downstream | upstream}—This keyword
combination enables one or more temporary CPE devices to inherit and
filter by the default downstream cable modem group, or by the default
upstream cable modem group.
• filter-group cpe {downstream | upstream}—This keyword
combination enables one or more temporary CPE devices to inherit and
filter by the default downstream CPE group, or by the default upstream
CPE group.
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