CHAPTER
83-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
83
Configuring Easy Virtual Network
Easy Virtual Network (EVN) is an IP-based virtualization technology that provides end-to-end
virtualization of two or more Layer-3 networks. You can use a single IP infrastructure to provide separate
virtual networks whose traffic paths remain isolated from each other.
This chapter contains the following sections
• Prerequisites for Configuring Easy Virtual Network, page 83-1
• Restrictions for EVN, page 83-1
• About Easy Virtual Network, page 83-2
• Configuring Easy Virtual Networks, page 83-14
• Configuration Examples for Configuring EVN, page 83-18
• Troubleshooting EVN Configuration, page 83-22
Prerequisites for Configuring Easy Virtual Network
• Implementing EVN in a network requires a single IP infrastructure that you want to virtualize into
two or more logical networks or L3VPNs. EVN provides path isolation for the traffic on the different
virtual networks.
• You must have a functioning campus design in place before adding virtualization to a network.
• You should understand virtual routing and forwarding (VRF) instances and how they are used to
maintain traffic separation across the network.
Restrictions for EVN
• EIGRP command inheritance is not supported on VNET interfaces.
• The vnet tag command does not support management VRFs.
• An EVN trunk is allowed on any interface that supports 802.1q encapsulation, such as Fast Ethernet,
Gigabit Ethernet, and port channels.
• There are additional platform and line-card restrictions for an EVN trunk. Check Cisco Feature
Navigator, for supported platforms and line cards.
• A single IP infrastructure can be virtualized to provide up to 32 virtual networks end-to-end.
• If an EVN trunk is configured on an interface, you cannot configure VRF-Lite on the same interface.
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