If you are using SCOM 2012 to monitor network devices that means you have to use resource pools. In order to create resource pool for network device you have to change the setting of the other default resource pools (Notifications Resource Pool, AD Assignment Resource Pool and All Management servers resource pool). These polls have to be set from automatic membership to manual for a certain reasons. Find these reasons and how to change the settings of these resource pools in an article titled Automatic and Manual Resource Pools in Operations Manager 2012 by Cameron Fuller.
Managing Resource Pools in Operations Manager 2012
Published by Stanislav Zhelyazkov
Stanislav Zhelyazkov has been working in IT since 2007. Stanislav has started his IT career as a Help Desk Specialist in 2007 while studying Informatics in the University of Ruse. He also worked in HP Enterprise Services (now known as DXC), maintaining large corporate IT infrastructures for clients in Holland, Switzerland and Germany and was involved in a Private Cloud project based on MS Hyper-V and System Center. He was also in the role of Principal Consultant in Lumagate developing and consulting companies on Azure, OMS, management and Private clouds. Currently he is Cloud Infrastructure Engineer at Sentia Denmark. Stanislav is active community member at MSDN forums providing answers on Azure. His blogposts can be found at www.cloudadministrator.net or www.systemcentercentral.com. View all posts by Stanislav Zhelyazkov