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8-1
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
8
Configuring IP Tunnels
This chapter describes how to configure IP tunnels using Generic Route Encapsulation (GRE) on Cisco
NX-OS devices.
This chapter includes the following sections:
• Information About IP Tunnels, page 8-1
• Licensing Requirements for IP Tunnels, page 8-3
• Prerequisites for IP Tunnels, page 8-4
• Guidelines and Limitations, page 8-4
• Default Settings, page 8-4
• Configuring IP Tunnels, page 8-4
• Verifying the IP Tunnel Configuration, page 8-10
• Configuration Examples for IP Tunneling, page 8-10
• Additional References, page 8-11
• Feature History for Configuring IP Tunnels, page 8-11
Information About IP Tunnels
IP tunnels can encapsulate a same-layer or higher layer protocol and transport the result over IP through
a tunnel created between two devices.
This section includes the following topics:
• IP Tunnel Overview, page 8-1
• GRE Tunnels, page 8-2
• Path MTU Discovery, page 8-3
• Virtualization Support, page 8-3
• High Availability, page 8-3
IP Tunnel Overview
IP tunnels consists of the following three main components:
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