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Chapter 2
Cisco CMTS Configuration Commands
To use the remote-query feature, you must configure the CM and Cisco CMTS as follows:
•
•
•
You must specify matching community strings for the CM, the snmp-server community community-
string command, and the cable modem remote-query command.
You can reissue the cable modem remote-query command to change the polling interval at any time,
Note
and the change becomes effective immediately. However, to change the SNMP community string, you
must first disable remote polling with the no snmp manager and no cable modem remote-query
commands. Then reconfigure the new community string with the snmp-server community community-
string, snmp-server manager, and cable modem remote-query commands.
After enabling the remote-query feature, you can display the collected statistics with the
Tip
modem remote-query
CISCO-DOCS-REMOTE-QUERY-MIB
Examples
The following example illustrates how to set the polling interval to 5 seconds and the SNMP community
string to private:
Router# configure terminal
Router(config)# cable modem remote-query 5 private
Router(config)# snmp-server community private
Router(config)# snmp-server manager
Router(config)#
The following example demonstrates how to change the remote-query configuration, by first deleting the
existing configuration and then giving the new configuration:
Router# configure terminal
Router(config)# no cable modem remote-query
Router(config)# no snmp-server manager
Router(config)# cable modem remote-query 10 public
Router(config)# snmp-server community public
Router(config)# snmp-server manager
Router(config)#
OL-1581-08
Configure a read-only SNMP community string on the CM for use with the remote-query feature.
This typically should be a separate community string from the read-write string used to remotely
monitor and configure the CM.
Configure a matching community string on the Cisco CMTS using the snmp-server community
community-string and snmp-server manager commands.
Enable the remote-query feature on the Cisco CMTS with the cable modem remote-query polling-
delay community-string command. The polling-delay should be chosen so that the statistics can be
obtained in a timely manner without seriously impacting system performance. Cisco recommends
initially setting the polling-delay to 30 seconds and adjusting that time period as needed.
Note
The polling-delay time period determines only how long the Cisco CMTS waits after
completing one polling cycle before beginning a new polling cycle. It does not indicate how
long the Cisco CMTS spends in each polling cycle, which depends on the number of cable
modems being polled. To calculate the approximate time for a polling cycle, assume 4 to 5
CMs per second (100 to 200 milliseconds per CM). Also take into account the possibility
that one or more cable modems might not respond, with an approximate timeout period of
90 seconds.
command. You can also display these statistics by querying the attributes in the
MIB.
Cisco Broadband Cable Command Reference Guide
cable modem remote-query
show cable
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