This chapter began with an introduction to routing, including a look at the difference between routed (IP and IPX) and routing (RIP and IGRP) protocols. The communication process on a simple one-router network was described step-by-step, and included an overview of the different processes that take place when a host on one network attempts to […]

For the purpose of both the CCNA and CCDA, you’ll also need to be familiar with routing IPX traffic across an internetwork. Recall from Chapter 7 that IPX functionality is enabled on a router through the use of the ipx routing command. After issuing this command, you can assign IPX addresses to interfaces by providing […]

In the same way that you can set a default gateway on your desktops and servers, you can also set a default gateway of sorts on your Cisco router – the gateway of last resort. While the name is different, the function is the same. Remember that when a router comes across a packet destined […]

Information about IGRP messages can be obtained with the debug ip igrp command. Unlike RIP, the command requires additional information. Two types of debugging information are available for IGRP – information about IGRP events, and information about IGRP transactions. The debug ip igrp events command provides summary information about the IGRP updates being sent and […]

The configuration of IGRP is only slightly different than that of RIP. The major difference is that IGRP routers are made part of what is known as an autonomous system (AS), a grouping that defines routers that should exchange routing tables. For example, if a router is made part of AS 100, it will only […]

The Interior Gateway Routing Protocol (IGRP) is another distance vector protocol commonly used on Cisco networks. Developed by Cisco, IGRP is proprietary and provides a number of advantages over RIP on a network comprised of Cisco routers. Firstly, the maximum hop count allowed by IGRP is much greater than RIP – up to 255 hops […]

Once RIP is up and running, it can largely be left alone. However, there are a number of commands that you should be familiar with in order to gain information about the status of RIP, or for troubleshooting purposes.
Of these commands, the most basic and useful is the show ip protocols command. The command will […]

In this section we’re going to configure a simple network with two routers to run RIP. Our network in consists of three subnets, 10.0.10.0/24, 10.0.20.0/24, and 10.0.30.0/24, as shown in the figure below. Our goal is to ultimately have Router A learn about network 10.0.30.0 from Router B, and Router B learn about network 10.0.10.0 […]

The Routing Information Protocol (RIP) is a simple distance-vector protocol. In order to avoid confusion, you should be aware that two versions of RIP exist – RIP version 1 (RIP), and RIP version 2 (RIPv2). For the purpose of the CCNA exam, you need to be familiar with RIP version 1, which is what we’ll […]

Some protocols can’t be so clearly defined as either distance-vector or link state. A great example is Cisco’s Enhanced IGRP (EIGRP), which is more accurately defined as a hybrid between the two. While distance vector protocols typically rely on the broadcast of complete routing tables, EIGRP instead only sends out specific updates when the metric […]