Configuring Headend Broadband Access Router Features
Configuring Cable Profiles
Verifying Cable Modulation Profiles
To verify whether or not a cable modulation profile has been created and to see how it is configured,
enter the show cable modulation-profile command:
CMTS01# show cable |
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Mo | IUC | Type | Preamb | Diff | FEC err FEC | Scrambl | Max | Guard | Last | Scrambl | Preamb | |
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| length | enco | correct | T | seed | B | time | CW |
| offset |
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| bytes |
| size size | short |
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1 | request qpsk | 64 | no | 0x0 | 0x10 | 0x152 | 1 | 8 | no | yes | 56 | |
1 | initial qpsk | 128 | no | 0x5 | 0x22 | 0x152 | 0 | 48 | no | yes | 0 | |
1 | station | qpsk | 128 | no | 0x5 | 0x22 | 0x152 | 0 | 48 | no | yes | 0 |
1 | short | qpsk | 72 | no | 0x5 | 0x4B | 0x152 | 0 | 8 | no | yes | 48 |
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
•Make sure you are in global configuration mode.
•Make sure you typed the correct modulation profile number and profile elements when you used the command.
•Return to the default settings.
Configuring QoS Profiles
The Cisco uBR7200 series router supports multiple QoS profiles. QoS profile 1 is used during cable modem registration; QoS profile 2 is the default QoS profile. Both of these profiles are preconfigured and cannot be removed. However, you can modify these profiles and create additional QoS profiles for various traffic flows.
To create or change a QoS profile, use the first command in the following table, plus as many of the additional commands as are necessary to make the changes you require. All of the QoS profile commands are global configuration commands.
| Command | Purpose |
Step 1 |
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CMTS01(config)# cable | Creates a new QoS profile with a profile number of | |
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| groupnum , or modifies an existing profile. |
Step 2 |
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CMTS01(config)# cable | Sets the bits in the ToS byte that enable you to | |
| configure individual data rate limits on a | |
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| basis. Valid values are from 0 to 7. |
Step 3 |
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CMTS01(config)# cable | Sets the guaranteed minimum upstream rate in kbps. | |
| Valid values are from 0 to 100000 kbps. Default = 0 | |
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| (no reserved rate). |
Step 4 |
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CMTS01(config)# cable | Sets the maximum upstream transmit burst size in | |
| size | bytes that the cable modem can send for any single |
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| transmit burst. Valid values are from 0 to 4080 bytes. |
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| Default = 0 (variable). Recommended max burst size |
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| = 1600. |
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Cisco IOS Multiservice Applications Configuration Guide
