Corporate Headquarters

address 
o
r 
hostname
) the headquarters router will use when 
communicating with the remote office router during IKE 
negotiations. This example specifies the 
address
keyword, which uses IP address 172.17.2.4 (serial 
interface 1/0 of the headquarters router) as the identity for 
the headquarters router.
Step 2
hq-sanjose(config)#
crypto isakmp key test12345 
address 172.24.2.5
At the local peer
: Specify the shared key the 
headquarters router will use with the remote office router. 
This example configures the shared key test12345 to be 
used with the remote peer 172.24.2.5 (serial interface 1/0 
on the remote office router).
Step 3
ro-rtp(config)#
crypto isakmp identity address
At the remote peer
: Specify the ISAKMP identity 
(
address o
r 
hostname
) the remote office router will use 
when communicating with the headquarters router during 
IKE negotiations. Again, this example specifies the 
address
keyword, which uses IP address 172.24.2.5 
(serial interface 1/0 of the remote office router) as the 
identity for the remote office router.
Step 4
ro-rtp(config)#
crypto isakmp key test12345 
address 172.17.2.4
At the remote peer
: Specify the shared key to be used 
with the local peer. This is the same key you just specified 
at the local peer. This example configures the shared key 
test12345 to be used with the local peer 172.17.2.4 (serial 
interface 1/0 on the headquarters router).

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Cisco IOS VPN Configuration Guide
OL-8336-01
Chapter 3 Site-to-Site and Extranet VPN Business Scenarios