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Encoder Data Matrix ECC200 in Software Figure 6-6: Dedicated vs shared interfaces

Figure 6-6: Dedicated vs shared interfaces
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NoteUse a crossover cable, or the crossover port, when connecting a hub to a switch ATM SWITCHES To maximize the unique capabilities of Asynchronous Transfer Mode, an ATM switch will typically be deployed with ATM technology There are several types of ATM switches: Workgroup ATM switches Campus ATM switches Enterprise ATM switches ROUTER SWITCHING Switch technology on routers is used for communication between unique LANs and WANs Since a router is not a true switch, but rather just offers switching technology, router switching is not discussed in great detail in this chapter Following are some key differences between a switch and a router used for switching: The LAN switch is based on layer 2 A router is based on layer 3 of the OSI model Switches forward packets based on the MAC address Routers forward packets based on the IP address A router understands IP subnets and unique IP networks A switch only understands subnets A switch's security is limited to creating filters based on layer-2 options such as the destination and source MAC addresses, protocol type, and packet length A router can provide additional security based on layer-3 TCP/IP ports and network IP addresses A router doesn't care what type of media are being switched, because it forwards traffic based on the IP address and not the machine address Therefore, it does not require the translation overhead
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During the design of a switched network, it's important to have a common software infrastructure that will create a compatible platform between a variety of switching platforms (LAN, ATM, and routers) Choosing one network manufacturer for all the network hardware will make it easier to manage the logical topology In addition, you'll be able to monitor and control sensitive or private traffic by using a standardized mechanism for traffic security Cisco IOS switching software uses standard protocols to create a common infrastructure that provides switching across a switched network, in addition to advanced capabilities such as virtual LANs
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In order to maintain a switched network, the network engineer needs to be able to monitor, configure, plan, and analyze the network's devices and services There are several management tools that offer these capabilities, including Cisco Visual Switch Manager Software Cisco IOS Command-Line Interface CiscoWorks for Switched Internetworks (CWSI) SNMP Network Management Platforms (including HP OpenView and SunNet Manager) Cisco Visual Switch Manager and the Cisco IOS Command-Line Interface are used primarily for day-to-day configuration of your switches These tools do offer limited management and monitoring capabilities; but for those of you with large networks that are harder to manage one switch at a time, we recommend you use a more dedicated tool such as CiscoWorks for Switched
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Internetworks (CWSI) or some other type of SNMP Network Management Platform CISCOWORKS SWITCHED INTERNETWORKS (CWSI) CiscoWorks Switched Internetworks (CWSI) is a network management platform based on the Simple Network Management Protocol (SNMP) and Remote Monitoring (RMON) CWSI also leverages the information-sharing capabilities of Cisco Discovery Protocol (CDP), Virtual Trunk Protocol (VTP), and Inter-Switch Link (ISL), which are technologies used by switches CWSI is a configuration and analysis tool for optimizing LAN and WAN performance, reducing the complexity of managing switched internetworks and providing a graphical display CWSI contains VlanDirector, a virtual LAN management application for Cisco Catalyst switches VlanDirector helps you to centrally create, modify, and manage VLANs VlanDirector is defined further later in this chapter
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Unlike some other network devices, you don't have to configure a switch; it will function straight out of the box It may not do exactly what you intended it to do, but it will work As soon as you plug in a switch attached to your network segments, the switch will start forwarding packets to the compatible devices The settings you may need to modify on the switch are as follows: Settings to change the configuration of the port: Set the speed Change to full-duplex or half-duplex Make the port a trunk port (trunk ports will be defined in a later section) Allocate the port to a VLAN other than the default Management settings: Set the IP address, mask, and default gateway Designate SNMP community names Set SNMP trap receivers Record administrative information such as the switch name, location, contacts To secure access to the switch: Set authentication items; TACACS+ or local usernames and password Designate EXEC password
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