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SCOM 2012 – Monitoring SNMP enabeled devices

February 29, 2012

Sinds everybody is talking about network monitoring in SCOM 2012 i thought it would be time for me to take a look at this myself. With the current SCOM 2007 network monitoring is very limited and if you needed more information about you’re network devices you had to buy a Management Pack from a third party. I wonder if this is still neccesary. This article will cover the dicovery for SNMP enabeled network devices.

For this test i have setup a test environment on a virtual environment running on Hyper-v. In an earlier blog i descibed the steps for the installation and configuration:

SCOM 2012 – Basic Installation and SCOM 2012 – Setup Reporting

I got a Cisco 2970 switch setup and connected to the network. I configured the switch with an IP adress and community strings:

If you do not have access to physical network devices you can also use the virtual stuff like the SNMP simulator from JalaSoft which can be donwloaded for free. If you like to know how to set this up, Kevin Holman wrote a nice blog about this.

Now let’s start discovery. The nice think about the Discovery Wizard is that everything needed along the way is presented to you with the possibility to directly create it and continue with the wizard. So the first step is to go to the administration pane, network management and select discovery wizard.

On the first page make up a logical name and description. The select an available managment server that wil run the discovery. Note that a management server can only have one discovery configured! In this first screen you can also set up a resource pool which i will do especcially for network devices:

Resource pools are new in SCOM 2012 and are used to create a high available environment. ( http://technet.microsoft.com/en-us/library/hh230706.aspx )

A new wizard will show up. I will call this resource pool Internal Network Devices:

Now on the next page it wil ask me for the pool members. Here it will advise two or more members (management servers) for high availability. So when one management server goes down the other one still monitors the environment. In this test i have only one management server so i drop that one in:

That’s it actually for creating the resource pool. When this is done the resource pool just created is shown in the wizard you where running before and you can continue. The next screen will ask you of you want to do a explicit or recursive discovery. Sinds i only have one network device at this time i will go the easy way and select explicit:

I need to specify an account which will be used for identifing the network devices. Sinds i don’t have one set up at this point i will use the nice button Create Account

Yeah! Another wizard! So after the introduction on this one i will be asked to give the account a name and a decription. Noticie that the account type is CommunityString:

 I need to provide the comminity string configured on my the network devices i want to monitor. In this case is create the READSecret. If more community strings are used over you’re network you can create and add more accounts.

When i click create the account is created and i am returned to the first wizard. The created account is visible and is selected. On the next page i have to add network devices. I can do an import from a txt file or add them manually. I add the only switch i have manually. Do not forget to configure the account you just created here:

Setting up a discovery channel. Just think: how many SNMP devices that is want to monitor are added in a week? Right, i leave it default and keep in mind that i can always run the discovery manually.

Now i get the summary of my settings and when i create SCOM 2012 will give me a notification:

 

Ehhhmm, sure help me out here so go ahead! The final screen offers me to do the discovery right away after closing the wizard. I keep that box checked and push the close button.

Now it will be a few minutes before the network devices will show up.

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