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SNMP setup

Experts,

I wanting to setup SNMP monitoring in network and need help. We have a commercial NMS to play the role of the manager in the network. We have several SNMP capable devices (Agents).

Do the MIs from the Agent vendor get loaded on both the Agent and the Manager (NMS)?
Do the MIBs determine what the NMS asks for when polling the Agent?
I guess I am confused at what role the MIBs play, as well if the OIDs are needed or inate to both devices?

Thanks.
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link334
Asked:
link334
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1 Solution
 
that1guy15Commented:
"Do the MIs from the Agent vendor get loaded on both the Agent and the Manager (NMS)?"
You should only need to load the mibs into the NMS. The devices or software you are monitoring should already have the proper mibs loaded and configured. this is usually done during install or setup and is built into the code.
"Do the MIBs determine what the NMS asks for when polling the Agent? "
The mibs are used to collect values from a device. So if your NMS wanted value x from a server then it would poll that device for the OID that is associated with x for that value.
MIBs are basically a list of all the values or components that can be monitored with SNMP. Each component or value with in a mib is called a OID. they are given a specific SNMP address and name so that snmp capable devices can collect this info.
Here is a good link that goes over some basics
http://www.webnms.com/snmpadaptor/help/quick_tour/snmp_basics.html 
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link334Author Commented:
thanks for the the response that1guy15. Your explanations make light of alot of reading.

Further clarification if you can do so.
"Each component or value with in a mib is called a OID. they are given a specific SNMP address and name so that snmp capable devices can collect this info."

I have downloaded and installed the MIBs from CISCO. Theses are alot of ".my" files. Are these files MIBs for a specific device or collectively a list of all of the potential OIDs for every device and its possible monitorable attributes? Specifically, do I need to load all of these or a specific file depending on the device or what I want to monitor, e.g. switch, router or interface, cpu utilization.

I hope this makes sense.
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link334Author Commented:
that1guy15,

Good article. The "SNMP TRAPS" section made more clear some items I saw in the NMS today.
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that1guy15Commented:
Cool! im glade that helped clear up some stuff. If your ? was answered dont forget to close it out and assign points.
Have a good new years!
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link334Author Commented:
that1guy15,

Please see the additional question from above...

"Each component or value with in a mib is called a OID. they are given a specific SNMP address and name so that snmp capable devices can collect this info."

I have downloaded and installed the MIBs from CISCO. Theses are alot of ".my" files. Are these files MIBs for a specific device or collectively a list of all of the potential OIDs for every device and its possible monitorable attributes? Specifically, do I need to load all of these or a specific file depending on the device or what I want to monitor, e.g. switch, router or interface, cpu utilization.

I hope this makes sense. Thank you for the help.
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that1guy15Commented:
Sorry i did not see your first comment only the second...
Yeah! Cisco has a ton of mibs. the are split up by feature and service being used for SNMP. This is just an example but BGP OIDs would be under one mib and VoIP OIDs would be under another MIB. So if you wanted to monitor both then you would need the two MIBs that relate to those OIDs.
You might have already stumbled across this site but the Cisco SNMP object Navigator is a great tool to figure out what mibs have each feature.
http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en
Also here is a good read on using MIB browsers to dig into MIBs. Using a MIB browser helps you determine what all OIDs a MIB has inside. If you are going to be working closley with SNMP then you will need to know how to use this tool. This article goes a little bit indepth but it gives the general point.
 http://www.unleashnetworks.com/resources/articles/88-how-to-effectively-use-a-mib-browser.html
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that1guy15Commented:
Also here is a good starting off point for Cisco MIBs
http://tools.cisco.com/ITDIT/MIBS/servlet/index 
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link334Author Commented:
Thank you that1guy15.

Although I have stumbeled across the object Navigator from CISCO, it never hurts to mention it as you have done. So thank you for pointing it out.

The second link is quite helpful, great catch.
"A MIB Module is just a file that contains definitions of related MIB objects"..."A plain MIB file looks like the image on the right."
Is their a standard file extension for the MIB modules, e.g. ".my or txt". I realize they are in the SMI format, but did'nt know if the extension mattered to the NMS or browser or if it was standard?

Thanks.

 
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link334Author Commented:
Thank you that1guy15, I did miss this link.
http://tools.cisco.com/ITDIT/MIBS/servlet/index

If you can clarify the previos question then I will close-out the question and assign the points to you.
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that1guy15Commented:
All mibs i have seen have a file extention of .mib. I have worked with several Linux NMS systems that will accept MIBs withoug an extension but for the most part they always have .mib
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link334Author Commented:
Thanks and Happy New Years to you too!
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