4-3
Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter 4 Configuring the VPN Acceleration Module
Configuration Tasks
Configuring IPSec
After you have completed IKE configuration, configure IPSec at each participating IPSec peer. This
section contains basic steps to configure IPSec and includes the tasks discussed in the following sections:
•
Creating Crypto Access Lists, page 4-3
•
Defining Transform Sets, page 4-4
•
Creating Crypto Map Entries, page 4-5
•
Verifying the Configuration, page 4-6
For detailed information on configuring IPSec, refer to the “
Configuring IPSec Network Security
”
chapter in the
Security Configuration Guide
publication.
Creating Crypto Access Lists
Crypto access lists define which IP traffic will be protected by encryption.
Note
IKE uses UDP port 500. The IPSec Encapsulation Security Protocol (ESP) and Authentication Header
(AH) protocols use protocol numbers 50 and 51. Ensure that your interface access lists are configured
so that protocol numbers 50, 51, and UDP port 500 traffic are not blocked at interfaces used by IPSec.
In some cases you might need to add a statement to your access lists to explicitly permit this traffic.
To create crypto access lists, use the following commands in global configuration mode:
For detailed information on configuring access lists, refer to the “Configuring IPSec Network Security”
chapter in the
Security Configuration Guide
publication.
Step
Command
Purpose
Step 1
access-list access-list-number {deny |
permit} protocol source
source-wildcard destination
destination-wildcard [log]
or
ip access-list extended name
Specifies conditions to determine which IP
packets are protected.
1
(Enable or disable
encryption for traffic that matches these
conditions.)
We recommend that you configure “mirror
image” crypto access lists for use by IPSec and
that you avoid using the any keyword.
1.
You specify conditions using anIP access list designated by either a number or a name. The access-list command designates
a numbered extended access list; the ip access-list extended command designates a named access list.
Step 2
Add permit and deny statements as
appropriate.
Adds permit or deny statements to access lists.
Step 3
end
Exits the configuration command mode.
