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Configuring Subscriber-End Broadband Access Router Features
Subscriber-End Broadband Access Router Initial Power-Up Sequence
MC-629
Cisco IOS Multiservice Applications Configuration Guide
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.
7. Transfer operational
parameters.
Using TFTP, the router downloads the specified
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
maintenance state.
As soon as the Cisco uBR900 series cable access
router has successfully completed the above sequence,
it enters operational maintenance state.
Table 40 Cable Access Router Initialization Sequences and Events (continued)
Sequence Event Description