cisco ccna full form

cisco ccna full form.. Configuring the IP address of the tunnel interface; . Enable routing (static or dynamic) to let the router know that it can travel to the specified network through the tunnel.GRE Command SyntaxCreating a tunnel interface and specifying its attributes is easy, as shown in the following configuration.Router(config)# interface tunnel interface^ Router(config-if)# tunnel mode gre ip Router(config-if)# tunnel source interface_name_or_local_IP_ addr Router(config-if)# tunnel destination reachable_IP_addr_of_peer Router(config-if)# ip address IP_addr subnet_maskChapter 24 Introduction to the WAN 667The tunnel interface number must be an unused tunnel interface number on the router, with a minimum possible value of zero. Specifying the encapsulation protocol (command tunnel mode) is optional and defaults to the GRE point-to-point interface if not specified. There are other encapsulation methods, but these are out of the scope of this book.You must specify the source endpoint of the tunnel (command tunnel source), which can be either the IP address of the local router's public interface or the name of the interface that owns that IP address. The tunnel destination is the reachable IP address of the target router (command tunnel destination). o These IP addresses must be reachable, and if the router is connected to the Internet, these addresses must be public IP addresses. This peer must also have a unique address located on the same subnet; in Figure 24.8, this is the address located on subnet 192.168.1.0/24.Because these connections are point-to-point, it is recommended that you use subnet mask /30 to save addresses, since this subnet mask provides exactly two host addresses.GRE Configuration ExampleHere is the same example as in Figure 24.8, where the GRE tunnel configuration for Router A is as follows.