Introduction to FlexVPN
Last Published Date: March 28, 2014
Internet Key Exchange
Version 2 (IKEv2), a next-generation key management protocol based on RFC 4306,
is an enhancement of the IKE Protocol. IKEv2 is used for performing mutual
authentication and establishing and maintaining security associations (SAs).
FlexVPN is Cisco's
implementation of the IKEv2 standard featuring a unified paradigm and CLI that
combines site to site, remote access, hub and spoke topologies and partial
meshes (spoke to spoke direct). FlexVPN offers a simple but modular framework
that extensively uses the tunnel interface paradigm while remaining compatible
with legacy VPN implementations using crypto maps.
This guide contains
the following modules:
Configuring Internet Key
Exchange Version 2 (IKEv2) and FlexVPN Remote Access
This module describes
IKEv2 CLI and is divided into basic and advanced sections.
The basic section
introduces basic IKEv2 commands and describes IKEv2 smart defaults and the
mandatory IKEv2 commands required for FlexVPN remote access. This module is a
prerequisite for understanding subsequent chapters.
The advanced section
describes global IKEv2 commands and how to override the default IKEv2 commands.
Configuring FlexVPN Server
This module describes FlexVPN server features, IKEv2 commands required to configure FlexVPN server, remote access clients and the supported RADIUS attributes.
Configuring FlexVPN Client
This module describes FlexVPN client features and the IKEv2 commands required for FlexVPN client.
Configuring FlexVPN Spoke to Spoke
This module describes the FlexVPN Spoke to Spoke feature and the IKEv2 commands required for FlexVPN Spoke to Spoke.
Configuring IKEv2 Load Balancer
This module describes the IKEv2 Load Balancer Support feature and the IKEv2 commands required to configure the IKEv2 Load Balancer.
Last Published Date: September 10, 2014
The IOS IKEv2 support for AutoReconnect feature of AnyConnect
feature helps in reestablishing IKEv2 negotiation without user interaction with
the Cisco AnyConnect client.
Configuring MPLS over FlexVPN
The MPLS over FlexVPN feature implements Multiprotocol Label
Switching (MPLS) over a dynamically established IPsec tunnel thereby supporting
duplicate address spaces.
Appendix: FlexVPN RADIUS Attributes
This module describes the RADIUS attributes supported by FlexVPN server.
Appendix: IKEv2 and Legacy VPNs
This module contains configuration examples on how to configure legacy VPNs such as crypto maps and DMVPN with Internet Key Exchange Version 2 (IKEv2).