The Cisco Security Device Manager (SDM) is an intuitive, Web-based device management tool integrated within Cisco IOS access routers. Cisco SDM simplifies router and security configuration through sophisticated wizards, enabling customers to quickly and easily deploy, configure, and monitor a Cisco access router without involving knowledge of the Cisco IOS Software command-line interface (CLI).
This article describes how to configure a default static route on a Cisco router using the Cisco SDM software. This post includes the Step-by-Step process to create a default route, and it will show you how to test your configuration. This article is designed for CCNA students, network engineers, and anyone looking to configure static IP routing using Cisco SDM (Cisco SDM is part of the CCNA syllabus).
For a machine to be able to contact another, must be put in place a mechanism that describes how to get from one to another. This is called routing. A route is defined by a pair of addresses: a destination and a gateway. The pair indicates that to reach this destination, you must pass through this gateway. There are three types of destinations: individual hosts, subnets, and `` default'' - the default destination. The default route (`` default route'') is used when no other routes apply. We talk a little about default routes later. There are also three types of gateways: individual hosts, interfaces (also called `` links''), and Ethernet hardware addresses (MAC addresses).
When the local system must connect to a remote machine, it consults the routing table to see if there is a known path. If the remote machine belongs to a sub-network to which the system knows to connect (Cloned routes), then the system checks if it can connect via this interface.
If all known paths fail, and then the system remains a last option: the default route. This road is a special type of gateway route (usually the only system), and is always marked with a c in the flags field. For LAN machines, this gateway is set with the machine that is directly connected to the outside world (whether via PPP link, DSL, cable, T1, or other network interface). If you set the default route on a machine that functions as a gateway to the outside world, then the default route will be the gateway of your Internet Service Provider (ISP).
The Default route is used on routers, which we do not want them carry detailed routing information about the network. For example, a router of branch office, a home router, etc...
The default route has the IP address 0.0.0.0 and a subnet mask of /0. You can also configure the default route on Cisco router using the ip route command.
Configuring a default route is an easy task, just follow these steps in order to configure a default route using Cisco SDM:
Step 1: Open Cisco SDM.
Step 2: Click Configure.
Step 3: In the Tasks bar, click Routing.
Step 4: In the Static Routing area, click Add in order to open the Add IP Static Route dialog box.
Step 5: Click Make this as default route.
Step 6: In the Forwarding area, enter the Next hop information (interface/IP address).
Step 7: In the Optional area, enter the route's metric. Additionally, click Permanent Router in order to prevent removing the route from the routing table if the interface connecting the router to the next hop router shuts down.
Step 8: Click Ok.
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