Cisco 7206 - VXR Router User Manual

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8-4
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 8 Configuring IP Tunnels
Prerequisites for IP Tunnels
Prerequisites for IP Tunnels
IP tunnels have the following prerequisites:
• You must be familiar with TCP/IP fundamentals to configure IP tunnels.
• You are logged on to the switch.
• You have installed the Enterprise Services license for Cisco NX-OS.
• You must enable the tunneling feature in a device before you can configure and enable any IP
tunnels.
Guidelines and Limitations
IP tunnels have the following configuration guidelines and limitations:
• Cisco NX-OS supports the GRE Header defined in IETF RFC 2784. Cisco NX-OS does not support
tunnel keys and other options from IETF RFC 1701.
• Beginning with Cisco NX-OS Release 5.2(5) and for later 5.2(x) releases, you can configure the
tunnel interface and the tunnel transport in different Virtual Routing and Forward instances (VRF).
The tunnels are supported only on M1 Series cards on Cisco Nexus 7000 Series platforms.
• Cisco NX-OS does not support WCCP on tunnel interfaces.
• Cisco NX-OS does not support GRE tunnel keepalives.
Default Settings
Table 8-1 lists the default settings for IP tunnel parameters.
Configuring IP Tunnels
This section includes the following topics:
• Enabling Tunneling, page 8-5
• Creating a Tunnel Interface, page 8-5
• Configuring a GRE Tunnel, page 8-7
• Enabling Path MTU Discovery, page 8-8
• Assigning VRF Membership to a Tunnel Interface, page 8-8
Table 8-1 Default IP Tunnel Parameters
Parameters Default
Path MTU discovery age timer 10 minutes
Path MTU discovery minimum MTU 64
Tunnel feature Disabled

Cisco 7206 - VXR Router Specifications

General

Brand	Cisco
Model	7206 - VXR Router
Category	Network Router
Language	English