Cisco Systems MC-607 manual MC-629

Configuring Subscriber-End Broadband Access Router Features

Subscriber-End Broadband Access Router Initial Power-Up Sequence

Table 40 Cable Access Router Initialization Sequences and Events (continued)

Sequence	Event	Description
7.	Transfer operational		Using TFTP, the router downloads the specified
	parameters.		DOCSIS configuration file and configures itself for the
			appropriate parameters. The DOCSIS configuration
			file defines the router operating mode such as the
			provisioned downstream and upstream service
			assignments, including assigned frequencies, data
			rates, modulation schemes, CoS, type of services to
			support, and other parameters. Cisco provides tools to
			help automate the creation of configuration files.
			Note	The DOCSIS configuration file must be in the
				exact format given by the DOCSIS
				specification. An incorrect DOCSIS
				configuration file can cause the Cisco uBR900
				series to constantly cycle offline. Such errors
				include wrong downstream frequency, wrong
				UCD, wrong downstream channel ID, invalid
				CoS, incorrect BPI privacy configurations or
				shared secret strings.
			The cable access router sends another registration
			request to the CMTS containing the CoS parameters
			given in the DOCSIS configuration file.
			The CMTS verifies that the router is using the
			appropriate CoS profile and converts the temporary
			SID into a data SID with a service class index that
			points to the applicable CoS profile.
8.	Perform registration.		The router completes its secondary ranging and is then
			online, passing data between the HFC network and the
			PCs and other CPE devices that are connected to the
			router.
9.	Comply 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		As soon as the Cisco uBR900 series cable access
	maintenance state.		router has successfully completed the above sequence,
			it enters operational maintenance state.

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 Cisco IOS image and runs the configuration file.

Cisco IOS Multiservice Applications Configuration Guide

MC-629