System information

-x DES -X 0p3nNMSv3 \

localhost .1.3.6.1.4.1.22736

If all goes well, you should get lots of lines back, including:

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.1 = STRING: "SIP"

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.2 = STRING: "IAX2"

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.3 = STRING: "Bridge"

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.4 = STRING: "MulticastRTP"

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.5 = STRING: "DAHDI"

SNMPv2-SMI::enterprises.22736.1.5.4.1.2.6 = STRING: "Local"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.1 = STRING: "Session Initiation Protocol(SIP)"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.2 = STRING: "Inter Asterisk eXchange Driver"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.3 = STRING: "Bridge Interaction Channel"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.4 = STRING: "Multicast RTP Paging Channel"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.5 = STRING: "DAHDI Telephony Driver"

SNMPv2-SMI::enterprises.22736.1.5.4.1.3.6 = STRING: "Local Proxy Channel Driver"

If you don’t get data returned right away, it could be because the Asterisk

res_snmp.so module has not reconnected to the SNMP daemon. You can force this

either by restarting Asterisk, or by unloading and reloading the res_snmp.so module

from the Asterisk CLI.

Monitoring Asterisk with OpenNMS

Once you’ve installed OpenNMS and configured Asterisk with the res_snmp module,

you can use OpenNMS to monitor your Asterisk server. You can configure what sta-

tistics are monitored, as well as what notifications you would like to receive based on

those statistics. Exploring the capabilities of OpenNMS is left as an exercise for the

reader. However, we have included a few graphs to demonstrate some of the basic

information you can collect from an Asterisk server. These graphs come from an

Asterisk server that is not very heavily loaded, but they still give a good indication of

what you might see.

Figure 24-1 contains a graph of how many channels were active in Asterisk at different

times.

Figure 24-1. Graph of active Asterisk channels

558 | Chapter 24: System Monitoring and Logging