Note: You can have multiple crypto maps defined in the configuration of a router but you can only have one applied to an interface at once time. If you have a router that needs to connect to multiple peers from the same interface, the peers will need to be defined in the single crypto map. You would can another numbered entry to the crypto map with different transform-sets and match ACLs.
This configuration would look like this:. Finally, we will the crypto map which ties together all the elements in our IPSec configuration and apply that to an interface. At this point, we'll want to verify that the VPN is working. If there isn't traffic going over the tunnel, you're not going to initially see anything. A good way to see that nothing is being sent or encrypted is to issue the show crypto ipsec sa command:.
As you can see from the output, nothing has been sent yet. Even though I don't have a routing protocol set up or static routes in place for the subnets on the other side, my edge router knows where to send traffic to get to the The next thing I'm going to do is trigger traffic to be sent from one peer to the other by pinging from one subnet to the other.
If you want to issue a show crypto isakmp sa , you can see the ISAKMP channel that is formed and that it's currently active:. Then looking back on our show crypto ipsec sa output, we can see the packets being encrypted and decrypted. Professional History. Cisco DNA. CCIE Security v5. Identity Services Engine. Microsoft Server. Nexus v. Training Reviews.
Video Training. Outbound packets that match this list are protected with IPsec. Inbound packets that match the reverse logic of the list are expected to be protected. Router A and Router B must agree to use a common transform set a common set of protocols and algorithms before an SA can be established. The command set peer Multiple peers can be configured by repeating the set peer command.
This provides a level of redundancy for when SAs are established: If the first peer is not reachable, the router attempts to establish the SA with the next peer in the entry. Like access lists, crypto maps do not do anything until you apply them to an interface. The proper place to apply the crypto map is the interface where the protected traffic exits the router: the interface that points in the direction of the remote peer.
In this example. Router A's Serial 1 interface is the exit point refer to Figure The following is the corresponding configuration on Router B only the relevant crypto map lines are shown :. NOTE Crypto access lists arc crypto map elements and interoperate with regular packet-filtering access lists that might exist on an interface.
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