When an IP packet is received the destination address is looked up in a route table to determine the next hop to send the packet to. Routers use IP addresses to direct the data to the correct destination. Network (Layer 3)-Routers are examples of how multiple sessions can be carried over a single connection using IP addresses as the identifier.Datalink (Layer 2)-Frame Relay, Asynchronous Transfer Mode (ATM), and Ethernet switches are all examples of how a single physical link may provide multiple logical or virtual connections per physical connection.Physical (Layer 1)-A Time Division Multiplexer (TDM) provides a way to make a single physical connection look like many physical connections, while still maintaining separation.Fundamentally, virtual networks all provide a mechanism to deploy what looks and operates like multiple networks, and are actually all using the same hardware and physical connectivity.Ī distinction needs to be made among the types of virtualization and which layer this network virtualization occurs at: Virtual networks is a generic term that uses many different technologies to provide virtualization. This includes making a single physical resource (such as a server, an operating system, an application, storage device, or network) appear to function as multiple logical resources or it can include making multiple physical resources (such as storage devices or servers) appear as a single logical resource. Virtualization is a technique for hiding the physical characteristics of computing resources from the way in which other systems, applications, or end users interact with those resources. This document provides an overview, a sample configuration, and other information for connecting and using Virtual Route Forwarding (VRF) with your network. Virtual Route Forwarding Design Guide for VRF-Aware Cisco UnifiedĬisco Unified CME SCCP Phone ConfigurationĬisco Unified CME SIP Phone ConfigurationĬonfiguring Cisco Unity Express for Cisco Unified CME Voice MailĬonfiguring Cisco Unified CME and DSP Farm on the Same Box for Conference, Transcoder, and Media Termination PointĬonfiguring Cisco Unified CME and DSP Farm on the Different Boxes for Conference, Transcoder, and Media Termination Point Virtual Route Forwarding Design Guide for VRF-Aware Cisco Unified Communications Manager Express Table Of Contents
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