Chapter 4 Troubleshooting the System
Managing Cable Modems on the HFC Network
To configure per modem filters, use the following commands in cable interface configuration mode.
Table
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| Configure access lists to be specified on a |
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{<macaddr><ipaddr> } access group <acl> |
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| received from cable modems and/or individual hosts |
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| are filtered based on the cable modem or the host the |
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| packets are received from. Use modem if the device |
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| is a cable modem. Use host if the device is a CPE |
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| device attached to a cable modem. |
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| Define the filter to be applied to the device and a |
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| given address. The macaddr specifies the cable |
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| modem’s or CPE device’s unique MAC address. |
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| Use the ipaddr option to specify the CM or CPE |
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| device’s current IP address. |
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| Use the acl option to assign the CM or CPE device |
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| to an access list. This defines the |
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| filter requirements implemented at the CMTS, rather |
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| than at the CM. Access list numbers are 1 to 99 for |
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| fast IP access lists, 100 to 199 for show extended IP |
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| access lists. |
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| Note Access list numbers of 700 to |
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| 799 do not apply. |
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Caution The system applies filters after the cable modem registers with the CMTS. Filter definitions are not saved across system reboots and must be applied each time a CM registers.
The software supports traps to alert CMTS administrators on CMs going offline or back online. A typical registration and login procedure is shown below:
1.The CM registers with the Cisco uBR7200 series.
2.The Cisco uBR7200 series sends traps to management systems in use for the network.
3.The management system sets per modem filters using SNMP or rsh.
4.The user logs in at the server.
5.The login server obtains required modem and CPE information from the Cisco uBR7200 series.
6.The login server sets
7.If the CM goes offline for a brief period of time, filters defined using the Cisco uBR7200 series remain active. If a CM stays offline for more than 24 hours, filter settings are reset.
8.If the user logs out or the login server detects that the user is not online, the login server sets default filters for the CM or the CPE device.
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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