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Step 1—Configuring the Tunnel

Cisco 7100 Series VPN Configuration Guide

3-6

Conﬁguring the Tunnel Interface, Source, and Destination

To conﬁgure a GRE tunnel between the headquarters and remote ofﬁce routers, you must

conﬁgure a tunnel interface, source, and destination on the headquarters and remote ofﬁce

routers. To do this, complete the following steps starting in global conﬁguration mode.

Note Thefollowingprocedure assumes the tunnelinterface, source, and destinationon the

remote ofﬁce router are conﬁgured with the values listed in Table 3-1.

Step Command Purpose

hq-sanjose(config)# interface tunnel 0

hq-sanjose(config-if)# ip address 172.17.3.3

255.255.255.0

Specify a tunnel interface number,

enter interface conﬁguration mode, and

conﬁgure an IP address and subnet

mask on the tunnel interface. This

example conﬁgures IP address and

subnet mask 172.17.3.3 255.255.255.0

for tunnel interface 0 on the

headquarters router.

hq-sanjose(config-if)# tunnel source 172.17.2.4

255.255.255.0

Specify the tunnel interface’s source

address and subnet mask. This example

uses the IP address and subnet mask of

T3 serial interface 1/0 of the

headquarters router.

hq-sanjose(config-if)# tunnel destination

172.17.2.5 255.255.255.0

Specify the tunnel interface’s

destination address. This example uses

the IP address and subnet mask of T3

serial interface 1/0 of the remote ofﬁce

router.

4 hq-sanjose(config-if)# tunnel mode gre ip Conﬁgure GRE as the tunnel mode.

GRE is the default tunnel

encapsulation mode, so this command

is considered optional.

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Cisco 7100 Series Spezifikationen Seite 36