![]() ![]() In boot mode, the router does not have ip routingenabled. You can also use this command when your low end Cisco router is in boot mode in order to TFTP a Cisco IOS® Software image to the router. For instance, if the router is a host in the IP world, you can use this command to define a default gateway for it. The ip default-gatewaycommand differs from the other two commands as it must be used only be used when ip routingis disabled on the Cisco router. The next IP commands are used and described in more detail: Default routes are invaluable in topologies where it is not desirable to learn all the more specific networks, as in case of stub networks, or not feasible due to limited system resources such as memory and limited resources. Background Informationĭefault routes are used to direct packets addressed to networks not explicitly listed in the routing table. Conventionsįor more information on document conventions, see the Cisco Technical Tips Conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The command outputs shown were taken from a Cisco 3900 Series router with Cisco IOS ®Software Release 15M. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. ![]() This document describes how to configure a default route or gateway of last resort. ![]()
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