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Setting up SNMP on Linkysys Switches

Posted on 2010-01-07
Medium Priority
Last Modified: 2012-08-14
I need to set up SNMP to see things like bandwidth utilization on interfaces.
I've got Linksys SRW208, SRW2016 and SRW224G4.
I'm right now using PowerSNMP Free.
I can get simple stuff out like sysName but I can't seem to get traps to show up at all.
I'm very new to SNMP so there are still some mysteries.
I see RMON in the switch but don't see how to tie it to SNMP.
I've set up the Notification Filter but don't see access to the listed OIDs
And, sometimes the Delete button is grayed out on the OID Subtree / View Type table so I can remove entries....
Question by:Fred Marshall
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LVL 41

Expert Comment

by:Kyle Abrahams
ID: 26204552
Welcome to the world of SNMP.

Try walking or using the getNEXT commands to retreive other values.  

Traps are sent from the device to some address where a listener takes the notification and does something with it.

Let me know if you have further questions.
LVL 26

Author Comment

by:Fred Marshall
ID: 26204622
OK.. thanks.  I half understand what you're saying.....
I'm using a Windows XP machine as the "server".
But what do I use to execute commands like getNEXT??
Is there a favored program for that purpose?

I'd like to use a free NMS software with reasonable GUI capabilities.  So, I installed PowerSNMP Free.  Any other suggestions for this?

LVL 41

Assisted Solution

by:Kyle Abrahams
Kyle Abrahams earned 400 total points
ID: 26204762
You can try this one:

Essentially set the OID to the sysname ( . . . and click walk or get_next.  If you use get_next continue to do so (the device will keep responding with the next OID it has).

Also see the PDF on SNMP, will help you a bunch.

Note the only thing you should need to do for the traps is setup where the device sends the info.  The traps are triggered by the firmware and are sent to your listener (in this case the XP machine)

Note this isn't a Network Monitoring System (unless the device has that capability, if so it's all in the device.)  SNMP just allows you to talk to and from the device.  

Basic definitions:
OID - Object Identifier.  Think of this like the unique address for whatever it is you're trying to get.  This is defined for each device . . . like an IP for a nic card.  Mibs have universal OIDs like the sysname (think of it like the universal loopback and then customized ones for the device.
MIB - Management Information Base.  Index of all the OIDs
Trap - Essentially this is a trigger.  Something happens and I need to notify the agent.
SNMPAgent - the listener that accepts traps.
SNMPManager - Software that talks to an SNMP enabled device.  This is different from the agent in the agent only listens for traps.  The manager can use get/set and manage the device.

Hope that helps.

LVL 26

Accepted Solution

Fred Marshall earned 0 total points
ID: 26212001
I discovered PRTG Free which made all the MIB stuff really unimportant / transparent.  I got everything set up and working once I'd installed it.  Well .... it took a bit of doing but recognizing properly set up devices was easy.  Devices included:
Juniper Networks
and they all just seemed to work once the settings were made for communication:
- community string
- server IP
- SNMP version
About all I have left to do is to customize what's monitored (like error rates).

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