How do i configure eigrp on a router

We will use same commands to assign IP addresses on interfaces of remaining routers. We need to provided clock rate and bandwidth only on DCE side of serial interface. Following command will assign IP addresses on interface of Router1.

Great job we have finished our half journey. Now routers have information about the networks that they have on their own interfaces.

Routers will not exchange this information between them on their own. If you are do not want to go through the above IP configuration processes, download this pre-configured topology. Basically we define a range of addresses and router search for these addresses in local interfaces.

Choosing this option allows us to configure the classful network. This option is very straightforward. All we need to do is, type the network ID with network command.

For example network For example Answer of this question is hidden in classful configuration. Consider following figure. We have four networks Classful configuration does not understand the concept of Subnetting. In classful configuration all these networks belong to a single network. Classful configuration works only with in default boundary of mask.

Default boundary of this address is 16 bits. So it will match only first 16 bits If we want excludes serial interfaces from EIGRP, we need to configure network command with more specific information. In this option we provide wildcard mask along with network ID. Wildcard mask allows us to match exact networks. With wildcard we are no longer limited with default boundaries.

We can match Subnetted networks as well as default networks. For example we were tasked to exclude serial interfaces in above configuration. We can use a wildcard mask of 0. Now router will look for Our serial interfaces have If you are unfamiliar with wildcard mask, I suggest you to read our tutorials on ACL where we explained wildcard mask in detail with examples. Until you learn wildcard mask, use subnet mask in the place of wildcard mask.

Subnet mask is a substitute, not a replacement of wildcard mask. When we use Subnet mask, router converts them in wildcard mask before searching for associated interfaces. We can look in running configuration to know what exactly being used by router. If you are a CCNA candidate or preparing for any Cisco certification, I suggest you to use wildcard mask instead of Subnet mask with network command.

EIGRP supports both equal and unequal load balancing, unlike other routing protocols. Equal load balancing allows routers to distribute traffic between two or more routes having equal metrics. For unequal load balancing, the paths to the destination network do not need to have equal metrics or cost to provide load balancing. Unlike other routing protocols that support only equal load balancing, EIGRP supports both equal and unequal load balancing.

Routes information is distributed over networks, which makes them susceptible to attacks. EIGRP, like other routing protocols, supports authentication to ensure that only authentic routing information is transmitted. The IANA AS number is assigned to a collection of networks under the administrative control of a single organization representing a common routing policy on the internet.

In this section, we will look at the IPv4 implementation. It should be unique for each router as it is used to identify the router in a given EIGRP routing domain. Enable EIGRP on an interface using the network ipv4-address command - this command will enable any interface on the router that matches the specified address and include it in the EIGRP routing update.

In the situation where you do not want to include all interfaces within a network, then you can use a wildcard mask to exempt such network using the command:. The figure above is the topology used for this tutorial. For a better understanding, the Packet tracer activity file used for this tutorial can be downloaded from this activity file.

The reader can use this to practice the configuration of EIGRP on routers 1 and 2 because only router 3 will be configured in this tutorial. Configure the router ID using eigrp router 3. This command will enable any interface on the router that matches the specified addresses to be included in the EIGRP routing update. This is because this interface is connected to an Internet service provider ISP which is not under the administrative control of the organization.

This is necessary to increase security controls. EIGRP is one of the most used dynamic routing protocols in existence. This is because it offers more functionalities than other dynamic routing protocols. It is a full-featured routing protocol that can grow as your network grows. This number should be the same on all routers. Once you are through this stage, next step is to instruct the router in order to advertise the networks that are directly linked to it. You can do it with the help of command.

Where X. X is the network id of a network that is linked directly to the router. You should enter this command for each network directly attached to the router.

However, you can, in a single statement, enter the supernet of a group of subnets.