Configure a GRE Tunnel, Map | Cisco Systems OL-6426-02 specification

Chapter 7 Configuring VPNs Using an IPSec Tunnel and Generic Routing Encapsulation

Configure a GRE Tunnel

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Apply the Crypto Map to the Physical Interface

The crypto maps must be applied to each interface through which IPSec traffic flows. Applying the crypto map to the physical interface instructs the router to evaluate all the traffic against the security associations database. With the default configurations, the router provides secure connectivity by encrypting the traffic sent between remote sites. However, the public interface still allows the rest of the traffic to pass and provides connectivity to the Internet.

Perform these steps to apply a crypto map to an interface, beginning in global configuration mode:

	Command or Action	Purpose
Step 1
Step 1	interface type number	Enters interface configuration mode for the
		interface to which you want to apply the crypto
	Example:	map.
	Router(config)# interface fastethernet 0
	Router(config-if)#
Step 2
Step 2	crypto map map-name	Applies the crypto map to the interface.
	Example:	See th e Cisco IOS Security Command Reference
	Example:	for more detail about this command.
		for more detail about this command.
	Router(config-if)#crypto map static-map
	Router(config-if)#
Step 3
Step 3	exit	Enters global configuration mode.
	Example:
	Router(config-if)# exit
	Router(config)#