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The first table we will look at is the neighbor table Neighbors are discovered when they send a hello packet to a neighboring router All hello packets are used to form the neighbor table, which is where routers keep information regarding the state of adjacent neighbors Hello packets include a HoldTime, the amount of time in which a router receiving the hello packet will treat the sender of the hello as reachable If another hello is not received within the HoldTime, DUAL is informed of the change of state This table also keeps track of Reliable Transport Protocol (RTP) sequence numbers and estimates an appropriate time for retransmission requests for RTP packets EIGRP has a topology table that contains all destinations advertised by neighboring routers, along with the metric value for each destination This topology table forms the basis for input to the DUAL calculations The output of DUAL feeds into the routing table A topology table entry for a destination can be in one of two states, either active or passive (the normal condition) A route only becomes active when an event occurs to cause a route recalculation due to some router or link becoming unavailable An entry in the topology table gets moved to the routing table when what is known as a feasible successor has been found A feasible successor can be thought of as the best alternative path to a destination, if the best path fails If there is a feasible successor for an entry in the topology table, and the neighbor chosen for this entry stops sending hello packets, the entry will not go active in the topology table Having a feasible successor therefore is a good thing, because it avoids a full recalculation of the DUAL algorithm in the event of a network failure EIGRP is a proprietary Cisco technology, and therefore has good compatibility with IGRP EIGRP updates are not backwardly compatible with IGRP updates, but there is an automatic redistribution scheme for interoperability of IGRP and EIGRP routes, and there exist directly translatable metrics between IGRP and EIGRP (Redistribution will be discussed later in this chapter).

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CISCO4000#configure Configuring from terminal, memory, or network [terminal] Enter configuration commands, one per line End with CNTL/Z CISCO4000(config)#line vty 0 4 CISCO4000(config-line)#login CISCO4000(config-line)#password bad4you CISCO4000(config-line)#exit CISCO4000(config)#exit

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4:

The following is a typical configuration to define EIGRP as a routing protocol on a Cisco router:

When your system wants to send data to another system on the network, it looks at its own network ID and compares that to the destination system s IP address If it appears that they both have the same network ID, the data is sent directly from your system to the destination system If the two systems are on different networks, your system must pass the data to the router so that the router can send the data to the destination system s router The question is now, how does your system know who the router is The answer is that is what the default gateway is The default gateway is the IP address of the router that can send data from your network In order to communicate on the Internet, your system will need to be configured with an IP address, a subnet mask, and a default gateway If you need to communicate only with other systems on your network, you will need only an IP address and a subnet mask To view your TCP/IP settings, you can go to a command prompt and type ipconfig you should see output similar to that shown in Figure 4-3 You will learn more about TCP/IP-related commands later in this chapter and in 6

A second area of security management involves controlling the flow of packets through the router To do so, you can configure one or more access lists and apply those lists to one or more router interfaces Because the focus of 7 is access lists, let's turn to that chapter to obtain the details associated with this important topic

figure 4-3

This section will introduce you to the binary representation of an IP address and ensure that before you move onto the next chapter (on subnetting) you feel comfortable with converting binary values to decimal and address classes

router eigrp 13 network 170400 network 2001010 The first line defines EIGRP as a process on the router for autonomous system 13 The second and third lines identify the directly attached networks that participate in the routing process EIGRP supports unequal-cost load balancing by the variance command in a fashion similar to that discussed for IGRP; in fact, the same command is used to specify the variance multiplier One area of configuration that differs between IGRP and EIGRP is the option to disable route summarization Route summarization is explained below In Fig 4-12 we have two companies, Company A and Company B Let's say Company A has to provide an information service to two locations of Company B Company B uses the 170200 network, with a netmask of 2552552550, which means it can provide 254 subnets, each capable of supporting 254 hosts with this one network number Company A uses the 150100 network, with subnet masks applied, so that this one network number can be used to connect many client sites to its internetwork

You know from the previous discussion that the IP address is a 32-bit address divided into four 8-bit blocks (called octets) The four octets are normally displayed as decimal values but also have a binary representation that looks like

In the previous chapters, we have reviewed the operation of many protocols As we will see, an understanding of the inner workings of these protocols and their address structure is critical to the proper construction and implementation of Cisco access lists In this chapter, we will begin our discussion by defining Cisco access lists and examining their role in securing Cisco networks We then examine the Cisco methodology for constructing and maintaining Cisco access lists Once we have a basic understanding of how access lists are constructed, we will begin our discussion of IP access lists and provide detailed examples showing their use We will also make a distinction between traditional IP access lists and next-generation IP access lists Next-generation IP access lists provide significant enhancements beyond the capability of traditional IP access lists

11000000 10101000 00000001 00001111