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Chapter 2
Cisco CMTS Configuration Commands
Table 2-20 TLV Values for Sample Option 43 Command (continued)
Type
TLV2—Static Downstream Frequency, Suboption 1
1
Both the Cisco vendor-specific option for a static downstream frequency and the
Note
instruct the CM to move to a specific downstream frequency, overriding the frequency the CM found
during its initial downstream scanning. However, the vendor-specific option requires the CM to use the
specified frequency—if the CM loses its lock on that frequency or can never lock on to that specific
frequency, the CM cannot go online. In contrast, the
downstream for the next available frequency if the CM loses its lock on the originally specified
frequency.
The following example shows how to configure a Cisco uBR924, Cisco uBR925, or Cisco CVA122 so
that it downloads a Cisco IOS configuration file named ios.cfg and configures the router for two voice
ports. Three vendor-specific options are included: suboption 8, which specifies the vendor ID, suboption
128, which specifies the configuration file name, and suboption 10, which specifies the number of active
voice ports.
router(config)# cable config-file iosfile.cm
router(config-file)# option 43 hex 08:03:00:00:0C:80:07:69:6F:73:2E:63:66:67:0A:01:02
router(config-file)# exit
router(config)#
The hexadecimal data shown in this command consists of the three TLVs shown in
Table 2-21 TLV Values for Sample Option 43 Command
Type
TLV 1—Vendor ID, Suboption 8
08
TLV2—Cisco IOS Configuration File, Suboption 128
80
TLV3—Number of Active Voice Ports, Suboption 10
0A
Cisco CMs also support giving a limited number of Cisco IOS configuration mode commands in the
DOCSIS configuration file, using vendor-specific suboption 131. The following example shows how to
use the option 43 command to specify that the Cisco CM should execute the ip http cable-monitor
advance command to enable its onboard Cable Monitor web server.
router(config-file)# option 43 hex 08:03:00:00:0C:83:1D:69:70:20:68:74:74:70:20:63:61:62:
6C:65:2D:6D:6F:6E:69:74:6F:72:20:61:64:76:61:6E:63:65
router(config-file)#
OL-1581-08
Length
Value
04
05:7F:9F:90 (sets the downstream for the static frequency of
92,250,000 Hz)
Length
Value
03
00:00:0C (the ID for Cisco cable equipment)
07
69:6F:73:2E:63:66:67 (ASCII hexadecimal bytes for ios.cfg)
1
02 (two voice ports)
frequency
command allows the CM to scan the
Cisco Broadband Cable Command Reference Guide
option
frequency
command
Table
2-21:
2-451
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