Before Launching Cisco Switch Network View in Software

Encoder Data Matrix in Software Before Launching Cisco Switch Network View

Before Launching Cisco Switch Network View
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The Cisco Discovery Protocol (CDP) is used to exchange information with other CDP-capable devices to create a graphical display This means you need to verify that all devices have CDP enabled (it is enabled by default) When CDP messages are exchanged, Cisco Switch Network View creates a network topology The device in which the software is executed is the primary device
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If you have multiple switches stacked together, only the three connected to the lowest port numbers of the primary server will be displayed All other switches within the stack are considered edge devices and will be displayed with less detail SNMP must be enabled and the community string set to public on all stack members
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Using Cisco Switch Network View
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When you click the Network View button, the application will take a while to collect the information necessary to display a map of your devices A new window opens, containing all devices running CDP and the links between them This Network View application is primarily a display tool, offering you options for device and link reports These reports provide limited configuration information that cannot be modified You have to use the Switch Manager application to perform modifications Figure 6-14 illustrates a simple map of two devices running CDP
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Figure 6-14: Switch Network View page
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Virtual LANs (VLANs)
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A virtual LAN (VLAN) is configured to group related users together regardless of their physical connection to the network A "group" of users typically includes those who share common resources a department, for example, or a functional group The VLAN acts as a group's own little network The users in various VLANs are logically separated and function just as if they were on separated physical hubs The virtual network allows its users to communicate without having to travel across several network devices Assignment of users no longer involves moving a physical cable in the network closet in the virtual environment, user adds, moves, and changes are all achieved using network management tools These tools allow you to reconfigure the users in a VLAN logically, in seconds Figure 6-15 illustrates a VLAN switched network
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Figure 6-15: VLAN switched network
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A VLAN adds several benefits to a switched network, including broadcast control, security, performance, and network management The switch isolates collision domains for attached hosts and only forwards appropriate traffic out of a particular port The virtual network environment, however, takes this concept one step further and provides isolation between VLANs A VLAN is a bridging domain that contains all broadcasts and multicast traffic By grouping related users into VLANs, their related traffic stays within the VLAN A switch needs to know how to forward traffic between VLANs traffic within the switch, and traffic among other switches This is done by maintaining ARP tables that include MAC addresses and their corresponding ports ARP tables are used internally by the switch and are continually broadcast to other switches The following ARP table contains the MAC address and VLAN ID that correspond to a host IP address Switch#show arp Protocol Address Age (min) Hardware Addr Type Interface Internet 101115 4 0000a0003800 ARPA VLAN1 Internet 1011313 4 0000a00236ad ARPA VLAN2 Internet 101131 70 00602fa3fabd ARPA VLAN2 Internet 10115 - 005080556f00 ARPA VLAN1 Internet 10102100 4 00105a9bb5e6 ARPA VLAN3 Cisco has proposed VLAN standards, including IEEE 8021Q and ISL (Inter-Switch Link) Both of these protocols are discussed in more detail later in this chapter
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VLAN Implementations
There are four types of VLAN solutions: port grouping, MAC-layer grouping, network-layer grouping, and IP multicast grouping Port grouping is the most common and is supported by the Catalyst 2900 series
Port Grouping
Typically, VLAN implementations define VLAN membership by assigning a VLAN to port numbers For example, ports 1, 3, 4, 5, and 6 are VLAN1, and ports 2 and 7 through 24 are VLAN2 Network administrators may mimic the ports associated with VLAN1 and VLAN2 (in this example) on separate switches throughout their network Such port grouping is the most common method of configuring VLANs, and the configuration is fairly straightforward There is a downside: if a workstation moves but needs to remain in the same VLAN, the network engineer needs to reconfigure the user's new port number
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