System Center Virtual Machine Manager 2012 SP1 (SCVMM 2012 SP1) added a lot of new features for networking. For example a logical switch which simplifies the deployment and configuration of virtual switches in your Hyper-V environment.
However those new features can be a bit difficult to understand. Lots of new terms are being used. Especially virtual networking in which VMs can move around Hyper-V infrastructures without changing IP-configuration is difficult to configure.
Microsoft and several bloggers made postings explaining SCVMM 2012 sP1 networking. A selection of the most interesting:
Using System Center 2012 SP1 – Virtual Machine Manager Logical Switch with Hyper-V (Thomas Maurer)
Basic Hyper-V Networking in System Center 2012 SP1 – Virtual Machine Manager (Thomas Maurer)
Networking in VMM Illustrated Overview (Technet.com) Lots of diagrams and explanation about networking.
A Different Perspective on VMM 2012 SP1 Networking (Technet.com) showing illustrations and having links to other postings.
System Center: Virtual Machine Manager Engineering Blog
Networking in VMM 2012 SP1 – Logical Networks (Part I)
Virtual Networking in VMM 2012 SP1 – Part 1
When things go wrong, check this list of knowledgebase articles
List of Public Microsoft Support Knowledge Base Articles for System Center 2012 Virtual Machine Manager Service Pack 1