In much the same way that a new version of RIP has been defined for use on IPv6 networks, a new version of OSPF is in the works as well. Referred to as either OSPF for IPv6 or OSPF version 3, this new version is fundamentally very similar to the IPv4 version of the protocol, […]

OSPF is a scalable, industry standard link state protocol used on IP networks and defined in RFC 2328. Because link state protocols build and maintain a topology database for a network based on first-hand knowledge rather than simply relying on the “hearsay” of neighbors, they tend to be more efficient in determining the most efficient […]

EIGRP operates through the use of four key technologies:
Neighbor Discovery. Similar to link state protocols, EIGRP routers also periodically send out “hello” packets, letting neighboring routers know that they are functioning and available. On a LAN or point-to-point links, these message are sent out as multicasts every 5 seconds. On a multipoint network (like Frame […]

While IGRP might be a better solution than RIP when it comes to scalability, EIGRP takes things many steps further. First of all, EIGRP is classless, meaning that it supports the use of VLSM. Unlike IGRP, EIGRP supports the routing of multiple protocols, including IP, AppleTalk, and IPX. EIGRP is usually described as a hybrid […]

Although RIPv2 represents a significant improvement over the original version, RIPv2 is still a routing protocol used for IPv4 networks only. Because of this, a new version of RIP, referred to as RIPng or RIP version 3 has been developed in order to support this popular distance vector routing protocol on IPv6 networks. In case […]

RIPv2 is the newer, enhanced version of the RIP routing protocol, and is specified in RFC 1723. In many ways, this newer version is still very similar to its predecessor – it is still a distance vector protocol that uses hop count as its metric (the hop count limit is still 15), and still has […]

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 […]