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In this section, we will examine the elements of switch configuration, using the menus in the Cisco Web-based management software (see Figure 6-9) This user-friendly interface is beneficial for configuring the following settings of the switch: System elements Port parameters Security optimization VLANs NoteStarting with this section, you'll be reading about configuring an installed switch The best thing you can do before you start this process is to have your switch's parameters all predetermined and documented Identify the items in the Switch Information Checklist provided earlier in the chapter, as well as the physical location of the switch and its connections to the network
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System Configurations
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The elements of a switch's core system configuration are similar to those of other network devices These include IP management, SNMP management, and switch software management The following sections define these elements as they pertain to switch configuration In Visual Switch Manager, they are managed with commands on the System menu
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IP addresses, masks, broadcast addresses, default gateways, the DNS server, and domain names are configured on a switch to optimize its capabilities Although none of these fields is required, their configuration is required for managing connections via Telnet and the Web-based management software Configuring this information also makes it easier to manage and troubleshoot the switch device
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The switch supports Simple Network Management Protocol (SNMP) SNMP consists of three parts: SNMP manager, SNMP agent, and Remote Monitoring (RMON) Management Information Base (MIB) The RMON MIB provides statistics only as high as data-link and physical-layer platforms such as the switch, and therefore no statistics are provided on IP or application-layer information For example, the Catalyst 2900 supports four RMON groups: Statistics Provides traffic and error statistics for a specified interface History Periodically samples statistics; can be used to establish baselines Alarms Generates alarms defined by the network administrator Events Sends traps or notifications from the alarm group to the SNMP manager The switch acts as an SNMP agent, and the network management software (Cisco- Works, for instance) acts as the SNMP manager The SNMP manager gathers data from the MIB and uses it to generate statistics about the SNMP agent The SNMP agent can also be configured to send traps or notifications of certain events, such as password failures, to the SNMP manager SNMP community strings (used to authenticate) and a trap server must be configured to order for a
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network management tool (such as CiscoWorks) to function SNMP is enabled and configured in the manager software, using the System | SNMP Configuration menu option Figure 6-10 shows the SNMP page from the Web-based management interface
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Figure 10: SNMP page in Cisco Visual Switch Manager
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Switch Hardware/Software Management
Using Cisco's Web-based management system, you can easily view the current version and status of the Cisco Switch IOS, hardware platform, and memory If additional features are required in connection with a later Cisco IOS release, the manager software also simplifies the task of upgrading the Cisco IOS image This new image is downloaded onto the TFTP server Using the Visual Switch Manager, select System | System Configuration Enter the IP address of the TFTP server, a filename to copy from, and a filename to copy to The Cisco IOS image will then be upgraded (assuming enough memory is available and the IOS version is supported)
Port Configurations
There are several configuration options for the ports of a switch, including enable/disable, port speed, duplex mode, port name, and so on In Visual Switch Manager, they are configured with commands on the Port menu Using pull-down menus and selecting check boxes, you can enable or disable the switch, assign 10 or 10/100 auto-sensing to Ethernet ports, choose half or full duplex, and assign a port name After you have selected the desired configuration for each port, click the Apply button Figure 6-11 shows the Port Configuration options in Visual Switch Manager
Figure 6-11: Port Configuration page in Cisco Visual Switch Manager TipIf you explicitly define the port speed on the switch, rather than let the switch set it, it's good practice to configure the attached device to use that speed, as well This can help you avoid problems with auto-speed negotiation that may impair connectivity
Port Groupings (EtherChannel)
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