Upgrading The Software Image - Cisco uBR924 Installation Manual

Chapter 1 Product Overview
Figure 1-1
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Figure 1-2
Note For better network performance, Cisco recommends a maximum limit of 16 CPE devices
in either bridging or routing mode. The service provider can also set a different limit by
changing the MAX CPE parameter in the DOCSIS configuration file—the default MAX
CPE value is one CPE device. The MAX CPE parameter applies in both routing and
bridging modes.

Upgrading the Software Image

When Cisco IOS images are updated to new releases, the service provider can download them as needed
to Cisco uBR924 routers installed in the field (based on the software licenses purchased). See the
release notes for the router (listed in "Related Documentation" in the Preface) for a complete list of
features and Cisco IOS images that are currently supported.
Service providers can use the router's Media Access Controller (MAC) address to uniquely identify
each particular router in the field. The CMTS uses this value to download the proper DOCSIS
configuration file to the router before it begins operation.
The DOCSIS configuration file can also contain the name of the software image that the router should
be running. If necessary, the CMTS can also download the proper software image to the router and force
it to reboot using the new image.
OL-0338-01 (3/2000)
Cisco uBR924 in a Bridging Configuration
CATV
coaxial cable
HFC
network
Cisco uBR924
cable access router
Routing—When installed and configured as a router, the Cisco uBR924 can be connected directly
to four PCs via the Ethernet hub ports at the rear of the router. One of the four Ethernet hub ports
can also be connected to a standard 10BaseT Ethernet hub which then connects additional
computers or Ethernet devices at the site to a local area network (LAN). (See Figure 1-2.)
Cisco uBR924 in a Routing Configuration
CATV
coaxial cable
HFC
network
In routing mode, no maximum limitation exists. The Cisco uBR924 is configured to use the IP
address of the headend router as the router's default IP gateway.
Ethernet
Ethernet
Ethernet
Ethernet
Ethernet
Cisco uBR924
Hub
cable access router
Cisco uBR924 Router Hardware Installation Guide
Cisco uBR924 Cable Access Router Description
PC
PC
PC
PC
Ethernet
LAN
1-3