Chapter 4 Configuring the VSA

Configuration Tasks

Creating Crypto Access Lists

Crypto access lists define which IP traffic will be protected by encryption. (These access lists are not the same as regular access lists, which determine what traffic to forward or block at an interface.) For example, access lists can be created to protect all IP traffic between Subnet A and Subnet Y or Telnet traffic between Host A and Host B.

To create crypto access lists, use the following command in global configuration mode:

Step

Command

Purpose

 

 

 

Step 1

Router(config)# access-listaccess-list-number {deny

Specifies conditions to determine which IP packets

 

permit} protocol source source-wildcard

will be protected.1 (Enable or disable crypto for

 

destination destination-wildcard [log]

traffic that matches these conditions.)

 

 

 

or

We recommend that you configure “mirror image”

 

Router(config)# ip access-list extended name

crypto access lists for use by IPSec and that you

 

avoid using the any keyword.

 

 

 

 

 

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.

 

 

 

1.You specify conditions using an IP access list designated by either a number or a name. The access-listcommand designates a numbered extended access list; the ip access-list extended command designates a named access list.

For detailed information on configuring access lists, refer to the “Configuring IPSec Network Security” chapter in the Security Configuration Guide publication.

Creating Crypto Map Entries

Step 1

Step 2

Step 3

You can apply only one crypto map set to a single interface. The crypto map set can include a combination of IPSec/IKE and IPSec/manual entries. Multiple interfaces can share the same crypto map set if you want to apply the same policy to multiple interfaces.

To create crypto map entries that do not use IKE to establish the security associations, use the following commands, starting in global configuration mode:

Command

Purpose

 

 

Router(config)# crypto map map-nameseq-num

Specifies the crypto map entry to create (or modify).

ipsec-manual

This command puts you into the crypto map

 

 

configuration mode.

 

 

Router(config-crypto-m)# match address

Names an IPSec access list. This access list

access-list-id

determines which traffic should be protected by

 

IPSec and which traffic should not be protected by

 

IPSec security in the context of this crypto map entry.

 

(The access list can specify only one permit entry

 

when IKE is not used.)

 

 

Router(config-crypto-m)# set peer {hostname

Specifies the remote IPSec peer. This is the peer to

ip-address}

which IPSec protected traffic should be forwarded.

 

(Only one peer can be specified when IKE is not

 

used.)

 

 

C7200 VSA (VPN Services Adapter) Installation and Configuration Guide

4-10

OL-9129-02

 

 

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Cisco Systems C7200 manual Creating Crypto Access Lists, Creating Crypto Map Entries