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Cisco EVN is a successor solution that offers numerous advantages over traditional Multi-VRF technology:
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Simplified: To simplify campus virtual-network solutions, the Cisco EVN is designed with following three
major components:
Virtual network (VNET) trunk: The Cisco EVN solution reduces 98 to 99 percent of configuration
complexities.
Route replication: A simplified unicast and multicast route-leaking capability enables shared network and
application services to virtual-network users. It replaces traditional Border Gateway Protocol (BGP)-
based route-leaking mechanics.
Routing context: Simplified and optimized virtual-network operation and troubleshooting are supported
on a per-VRF basis.
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Scalable: Cisco EVN enables flexibility to scale up to 32 virtual network solutions - operationally 4x virtual-
network scalability capacity over Multi-VRF technology.
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Interoperable: Cisco EVN provides network topology isolation based on an RFC-defined control plane; for
example, Enhanced IGRP (EIGRP), Open Shortest Path First (OSPF), Multicast etc. The data-plane
security and protection are maintained through industry-standard IEEE 802.1Q. In addition, the Cisco
EVN-supported system interoperates with peer Cisco EVN, Multi-VRF, and MPLS systems.
Features at a Glance
Cisco IOS XE Software LAN Base: This feature set on the Supervisor 7-E-based bundles provides Layer 2
features for access.
Cisco IOS XE Software IP Base: This feature set is upgradable with a software activation license (SAL). It
includes all Layer 2 features and some basic Layer 3 features. ISSU/SSO is supported in this package.
Cisco IOS XE Software Enterprise Services: This feature set is upgradable with a SAL; it supports full Layer 3
protocols and advanced features such as complete routing scalability (256,000), BGP, VRF, Policy-Based
Routing, and so on.
These features can be enabled using the software-licensing mechanism. For details about software licensing,
refer to the “Licensing” section later in this document or visit
http://www.cisco.com/go/sa.
For details about the supported features in these three images, refer to the Cisco IOS XE 3.1.0 SG Release Notes
at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_23474.html.
Industry Standards
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Ethernet: IEEE 802.3
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10 Gigabit Ethernet: IEEE 802.3ae
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IEEE 802.1D Spanning Tree Protocol
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IEEE 802.1w Rapid Reconfiguration of Spanning Tree
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IEEE 802.1s Multiple VLAN Instances of Spanning Tree
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IEEE 802.3ad LACP
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IEEE 802.1p CoS Prioritization
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