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Feature Overview
Configuration Options
The Cisco uBR900 series cable access router typically ships from the factory ready to work in the
Base IP Bridging (DOCSIS-compliant bridging) data-only mode. The cable access router is
configured automatically at startup by one or more configuration files generated by the cable service
provider and downloaded to the router; no configuration or setup is required other than to connect
the router to the cable system. The CMTS provides a path from the cable access router to the DHCP
server for PC address assignment.
The PCs connected to the Cisco uBR900 series must be configured for Internet Protocol (IP). Using
DHCP, the CMTS assigns an IP subnet address to the cable access router each time it connects to the
network. The IP addresses of the cable access router and the individual PCs attached to it enable the
CMTS to route data to and from the PCs.
Note
by default for DOCSIS-compliant bridging.
The configuration file or files downloaded to the Cisco uBR900 series by the CMTS at the headend
are dependent on the services purchased by the individual cable service subscriber. The cable access
router is provisioned in the following manner:
•
When the cable access router is first brought online, the CMTS downloads a binary file to the
router that is in DOCSIS-specified format. This file configures the router for the desired level of
service and sets other parameters as needed.
•
If additional features are required beyond basic DOCSIS-compliant bridging, the DOCSIS
configuration file can specify a Cisco IOS image that the CMTS should also download to the
router. (To speed up the time required to bring the router online, the cable service provider can
optionally preload the Cisco uBR900 series with the appropriate image at the warehouse.)
•
To customize the cable access router's configuration further, the DOCSIS configuration file can
also specify a Cisco IOS configuration file that the CMTS should download to the router. This
second configuration file is an ASCII text file that contains the Cisco IOS commands needed to
further configure the router as desired.
Note
and the Cisco IOS configuration file (if needed) only once when the router is initially brought online.
However, a new configuration file or image can be downloaded whenever necessary, such as when
the cable service provider offers new services or subscribers upgrade their services.
To ensure that you obtain the exact services that you have ordered, the Cisco uBR900 series arrives
from the factory with a unique identifier (UID) that consists of a serial number and MAC address.
These factory-assigned values are on a label at the bottom of the cable access router; for
convenience, these values are also in a barcode label that can be easily scanned for entry into the
service provider's provisioning and billing system.
Using the MAC address of the cable access router as the key, the CMTS downloads the DOCSIS
configuration file and Cisco IOS image that will provide the services that you have purchased.
Service technicians at the headend typically create a number of standard configuration files to match
the range of services offered by the provider; these configuration files can be created manually or
with tools provided for this purpose by Cisco Systems.
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Cisco IOS Release 12.0(7)T
When the Cisco uBR900 series cable access router is shipped from the factory, it is configured
The CMTS typically downloads the DOCSIS configuration file, Cisco IOS image (if needed),
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