Configuration Options
Configuring the Cisco uBR900 Series Cable Access Routers 21
At this point the router is online and operational in the basic DOCSIS bridging (“plug and play”)
mode. If the DOCSIS configuration file specifies that the router must download a Cisco IOS image
and a Cisco IOS configuration file, the router uses TFTP to download the image and configuration
file into its local memory. It then installs the new IOS image and runs the configuration file.
Downloading a DOCSIS configuration file to a Cisco uBR900 series cable access router
automatically:
•ends all telnet sessions
•disables the cable access router’s console port, preventing local access to the router’s CLI
•performs a “write erase” on the cable access router’s local configuration parameters
Telnet access to the router from the headend is still allowed, but only if the Cisco IOS configuration
file includes enable and line vty passwords; if the configuration file does not include enable and
line vty commands to specify these passwords, Telnet access and console access are both disabled.
9Comply with baseline privacy. If baseline privacy is configured and enabled on both the
router and CMTS, the router and CMTS negotiate the
appropriate encryption/decryption parameters and exchange
keys for privacy. After encryption is enabled, all information
sent within Ethernet packets is encrypted to prevent
interception or modification by an unauthorized party.
10 Enter the operational maintenance
state.
As soon as the Cisco uBR900 series cable access router has
successfully completed the above sequence, it enters
operational maintenance state.
Table3 Cable Access Router Initialization Sequences and Events (continued)
Sequence Event Description