Cisco Systems OL-6426-02 manual Configure the IPSec Crypto Method and Parameters

Chapter 6 Configuring a VPN Using Easy VPN and an IPSec Tunnel

Configure the IPSec Crypto Method and Parameters

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Perform these steps to specify the IPSec transform set and protocols, beginning in global configuration mode:

	Command or Action	Purpose
Step 1
	crypto ipsec transform-set transform-set-name	Defines a transform set—an acceptable
	transform1 [transform2] [transform3]	combination of IPSec security protocols and
	[transform4]	algorithms.
	Example:	See the Cisco IOS Security Command Reference
		for detail about the valid transforms and
	Router(config)# crypto ipsec transform-set	combinations.
	vpn1 esp-3des esp-sha-hmac
	Router(config)#
Step 2
	crypto ipsec security-association lifetime	Specifies global lifetime values used when IPSec
	{seconds seconds kilobytes kilobytes}	security associations are negotiated.
	Example:	See the Cisco IOS Security Command Reference
		for details.
	Router(config)# crypto ipsec
	security-association lifetime seconds 86400
	Router(config)#

Note With manually established security associations, there is no negotiation with the peer, and both sides must specify the same transform set.

Configure the IPSec Crypto Method and Parameters

A dynamic crypto map policy processes negotiation requests for new security associations from remote IPSec peers, even if the router does not know all the crypto map parameters (for example, IP address).

Perform these steps to configure the IPSec crypto method, beginning in global configuration mode:

	Command or Action	Purpose
Step 1
	crypto dynamic-map dynamic-map-name	Creates a dynamic crypto map entry and enters
	dynamic-seq-num	crypto map configuration mode.
	Example:	See the Cisco IOS Security Command Reference
		for more detail about this command.
	Router(config)# crypto dynamic-map dynmap 1
	Router(config-crypto-map)#
Step 2
	set transform-set transform-set-name	Specifies which transform sets can be used with
	[transform-set-name2...transform-set-name6]	the crypto map entry.
	Example:
	Router(config-crypto-map)# set
	transform-set vpn1
	Router(config-crypto-map)#

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

OL-6426-02 6-7