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Last Build Date: Thu, 25 Oct 2007 12:19:06 +0000


Creating an Instant Windows FTP Server

Mon, 09 Jul 2007 18:42:40 +0000

As part of my consulting work, I regularly find myself in need of a quick and efficient way to transfer files between different operating systems, like Windows and Linux. This is especially the case when I’m trying to deal with a Windows system that won’t boot and I need to recover data. When faced with … Continue reading "Creating an Instant Windows FTP Server"

Backing Up and Restoring Cisco Switch Settings

Thu, 05 Jul 2007 13:26:15 +0000

Much like with Cisco routers, it’s generally a good idea to back up the configuration of your switches as well. The syntax to copy the configuration of a Catalyst 1900 series to a TFTP server is different than on a router, although it does following a similar “copy from to” format. The example below shows … Continue reading "Backing Up and Restoring Cisco Switch Settings"

Configuring Spanning Tree Protocol Costs on a Cisco Switch

Thu, 05 Jul 2007 13:24:28 +0000

The purpose of the Spanning Tree Protocol (STP) is to prevent loops on a switched or bridged network. STP is enabled on Catalyst 1900 series switches by default. In fact, one instance of Spanning Tree is enabled for each and every VLAN. In earlier articles we examined some of the default settings relating to the … Continue reading "Configuring Spanning Tree Protocol Costs on a Cisco Switch"

Enabling and Configuring VLAN Trunking Protocol (VTP) on Cisco 1900 Switches

Thu, 05 Jul 2007 13:21:25 +0000

The VLAN Trunking Protocol (VTP) is used to manage the configuration of switches that are part of a VTP management domain, as we learned in Chapter 3. Recall that three VTP modes exist – server, client, and transparent mode. Once a VTP server is configured, any changes made (such as adding or removing VLANs) will … Continue reading "Enabling and Configuring VLAN Trunking Protocol (VTP) on Cisco 1900 Switches"

Configuring ISL Trunk Links

Thu, 05 Jul 2007 13:18:11 +0000

Earlier in Chapter 3, we looked at ways to connect switches with trunk links, such that VLANs could span multiple switches. The two main ways to accomplish this are via the Inter-Switch Link (ISL) and 802.1q frame tagging methods. The Cisco 1900 series does not support 802.1q, leaving ISL as the only option for creating … Continue reading "Configuring ISL Trunk Links"

Configuring VLANs on a Cisco Catalyst 1900 Switch

Thu, 05 Jul 2007 13:13:24 +0000

A VLAN is essentially a broadcast domain, assigned according to switch ports. By default, all ports on a Cisco 1900 are assigned to VLAN 1, sometimes referred to as the management or administrative VLAN. In order to implement additional VLANs, you will first need to define them, and then add ports to that VLAN. New … Continue reading "Configuring VLANs on a Cisco Catalyst 1900 Switch"

Cisco Discovery Protocol on Catalyst 1900 Switches

Thu, 05 Jul 2007 13:11:11 +0000

The Cisco Discovery Protocol (CDP) is used to gather information about neighboring Cisco devices. Cisco 1900 series switches also run CDP, with the same default parameters as a CDP-enabled router. The show cdp command shows the current CDP version, as well as CDP timer and holdtime intervals. The show cdp neighbors command will display a … Continue reading "Cisco Discovery Protocol on Catalyst 1900 Switches"

Configuring Cisco Switch MAC Address and Security Settings

Thu, 05 Jul 2007 13:08:53 +0000

A switch makes forwarding decisions based on the entries stored in its MAC address table. This table is built as the switch inspects the source addresses of frames as they enter the switch from devices connected to a given port. By default, a Catalyst 1900 switch can store up to 1024 entries in its MAC … Continue reading "Configuring Cisco Switch MAC Address and Security Settings"

Configuring Cisco Switch Ports

Thu, 05 Jul 2007 13:05:18 +0000

A Cisco 1900 is basically a plug-and-play switch. This means that you can treat a 1900 much like a hub by simply plugging computers (or other hubs) into its ports and allowing them to communicate. One reason this works is that all ports are part of the same VLAN by default. However, you may want … Continue reading "Configuring Cisco Switch Ports"

Configuring Switching Methods on a Catalyst 1900 or 2820

Wed, 04 Jul 2007 21:50:04 +0000

Recall from Chapter 3 that Cisco switches support three major switching methods – FragmentFree, Cut-Through, and Store-and-Forward. The Catalyst 1900 series supports only two of these methods, FragmentFree and Store-and-Forward. FragmentFree is the method configured by default. To view the current switching method enabled on a switch, use the show port system command. To change … Continue reading "Configuring Switching Methods on a Catalyst 1900 or 2820"