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Now that we have discussed some of the popular layer-1 devices, let s take a look at some popular layer-2 devices Layer-2 devices are a little smarter than layer-1 devices in the sense that they actually can make decisions about where the electrical signal needs to go Remember that a hub, which is a layer-1 device, would forward the signal to all ports on the hub, which will lead to traffic problems as you start adding hubs to the topology This section will introduce you to two layer-2 devices that often are used to filter network traffic By filtering network traffic, we are conserving precious bandwidth on the network, which will have a huge impact on the overall performance of the network

Routers make more complex decisions They must know how to get to all other network numbers on the internetwork and the best way to route the packets, and they need to keep track of an internetwork topology that is constantly changing due to equipment or other failures To execute

A bridge is a network connectivity device that is used to break the network down into multiple network segments A bridge runs at layer 2, the data link layer, and is used to filter traffic by only forwarding traffic to the destination network segment Figure 3-19 shows an example of a bridged network

In most cases, the boot register will be set to two, meaning that the router will look in the configuration file for boot commands If none are found, the router will load the first image found in Flash memory If there is no valid IOS image in Flash memory or Flash memory cannot be found the router attempts to load an image from a TFTP server by sending a TFTP request to the broadcast address requesting an IOS image Once the configuration register is checked, the bootstrap loader knows the location from which to load the OS image into the router's RAM and proceeds to do so After the OS is loaded, the bootstrap loader looks for a previously created and saved configuration file in NVRAM If the file is found, the file will be loaded into memory and executed on a line-by-line basis, resulting in the router becoming operational and working according to a predefined networking environment If a previously created NVRAM file does not exist, the OS executes a predefined sequence of question-driven configuration displays referred to as a Setup dialog Once the operator completes the Setup dialog, the configuration information will be stored in NVRAM and will be loaded as the default at the next initialization process The router can be instructed to ignore the contents of NVRAM by setting the configuration register If the second hexadecimal value from the right is set to four, 0x2142, the router will ignore the contents of NVRAM This feature is used during password recovery on the router, so that an administrator can bypass the contents of the configuration file The following display illustrates the initial display generated by a Cisco 4500 router as power is applied, as the bootstrap is invoked, and as a previously defined configuration is loaded into memory At the end of the display, take note of the prompt, which can easily scroll off a screen On occasion, this problem results in a novice waiting a considerable period of time for something to happen without realizing he or she needs to press the Return key to begin to access the system System Bootstrap, Version 52(7b) [mkamson 7b], RELEASE SOFTWARE (fc1) Copyright (c) 1995 by cisco Systems, Inc C4500 processor with 8192 Kbytes of main memory program load complete, entrypt: 0x80008000, size: 0x231afc Self decompressing the image : ################################################# ################################################################################ ########################################################### [OK] Restricted Rights Legend Use, duplication, or disclosure by the Government is.

figure 3-19

3:

these responsibilities, a router maintains a routing table, which lists all the known network numbers and how to get to them Routers also use routing protocols that keep the routing table accurate for a changing internetwork

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subject to restrictions as set forth in subparagraph (c) of the Commercial Computer Software - Restricted Rights clause at FAR sec 52227-19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec 252227-7013 cisco Systems, Inc 170 West Tasman Drive San Jose, California 95134-1706 Cisco Internetwork Operating System Software IOS (tm) 4500 Software (C4500-INR-M), Version 103(8), RELEASE SOFTWARE (fc2) Copyright (c) 1986-1995 by cisco Systems, Inc Compiled Thu 14-Dec-95 22:10 by mkamson Image text-base: 0x600087E0, data-base: 0x6043C000 cisco 4500 (R4K) processor (revision B) with 8192K/4096K bytes of memory Processor board serial number 73160394 R4600 processor, Implementation 32, Revision 20 G703/E1 software, Version 10 Bridging software X25 software, Version 20, NET2, BFE and GOSIP compliant 2 Ethernet/IEEE 8023 interfaces 1 Token Ring/IEEE 8025 interface 2 Serial network interfaces 128K bytes of non-volatile configuration memory 4096K bytes of processor board System flash (Read/Write) 4096K bytes of processor board Boot flash (Read/Write) Press RETURN to get started! Now that we have an appreciation for the basic hardware components of a router and its initialization process, let's turn our attention to router software In doing so, let's obtain an understanding of the two key software components of a router and the relationship of router commands to the software components