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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter5 Managing Cable Modems on the Hybrid Fiber-Coaxial Network
Configuring Sync Message Interval
Use the acl option to assign the CM or CPE device to an access list. This defines the per-CM or per-host
filter requirements implemented at the CMTS, rather than at the CM. Access list numbers are 1 to 99 for
fast IP access lists, 100 to 199 for show extended IP access lists.
Note Access list numbers of 700 to 799 do not apply.
Caution The system applies filters after the CM 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 per-CPE filter in the Cisco uBR7200 series. The per-CPE filter overrides the
per modem filter settings.
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.
Configuring Sync Message Interval
To specify the sync message interval between successive sync message transmissions from the
CiscouBR7200 series CMTS, use the following command in cable interface configuration mode.
Verifying Sync Message Interval
To determine if a sync message interval is configured, enter the showrunning-config command and
look for the cable interface configuration information. If the sync message interval is deactivated or reset
to its default value, the no sync interval command line appears in the output.
Command Purpose
cable sync-interval msec
no cable sync-interval
Specifies the interval in milliseconds between successive sync
message transmissions from the CiscouBR7200series CMTS.
Valid values are from 1 to 200 msec.
Default = 10 msec.
Returns the sync message interval to its default value of 10 msec.