Tunnel Interface Command Set - ADTRAN AOS Version R10.1.0 Command Reference Manual

Command Reference Guide
T I
UNNEL NTERFACE
The generic routing encapsulation (GRE) tunnel interface creates a virtual point-to-point link between
routers in an Internet Protocol (IP) network by encapsulating the IP packets first in a GRE packet (by
adding a GRE header), then in an IP version 4 (IPv4) packet (by adding an IPv4 header). When the packets
reach the terminating endpoint router, they are stripped of the IPv4 and GRE header to reveal the packet
payload.
This encapsulation process allows network routers to tunnel IPv4 traffic over an IPv4 network and IPv6
traffic over an IPv4 Internet connection (IPv6 over IPv4 GRE). For example, a host on an IPv6 network
cannot normally communicate with a host on another IPv6 network using an IPv4 Internet connection.
However, when using the GRE tunnel interface, the IPv6 packet is first encapsulated into a GRE packet,
and the GRE traffic is then encapsulated into an IPv4 packet between the two tunnel endpoints. The
terminating tunnel endpoint then removes the IPv4 and GRE headers, revealing the original IPv6 packet
before sending it on to the destination host.
To create a GRE tunnel interface and enter the Tunnel Configuration mode, enter the interface tunnel
<interface id> gre ip command at the Global Configuration mode prompt. For example:
>enable
#configure terminal
(config)#interface tunnel 1 gre ip
(config-tunnel 1)#
The following commands are common to multiple command sets and are covered in a centralized section
of this guide. For more information, refer to the sections listed below:
alias "<text>" on page 66
cross-connect on page 67
description <text> on page 70
do on page 71
end on page 72
exit on page 73
interface on page 74
shutdown on page 82
All other commands for this command set are described in this section in alphabetical order.
bandwidth <value> on page 2590
crypto map <name> on page 2591
dial-backup commands begin on page 2593
dynamic-dns on page 2610
ip commands begin on page 2614
ipv6 commands begin on page 2655
keepalive on page 2674
60000CRG0-35E
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OMMAND ET
Copyright © 2012 ADTRAN, Inc.

Tunnel Interface Command Set

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