Cisco Networking

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Cisco Switch Setup Wizard Execution

If you unpack your switch and plug it in, you will be running the generic factory configuration, the setup wizard. This configuration is enough to allow you to use the switch on the default VLAN — vlan [more…]

Cisco Web Console Overview

Cisco offers a web GUI tool, Web Console, to help you configure and manage your new switch if you would rather not to go into command line mode. If you refer to the default factory configuration, you will [more…]

Cisco Switch Configuration using Web Console

The GUI tool, Web Console is provided to assist you in configuring your Cisco switches. The Configuraton menu is available from the Dashboard which is the tool's main page. The Configure navigation menu [more…]

Cisco Switch Monitoring with Web Console

Cisco's Web Console tool provides you with information on the status of your network switches from its monitor section. The monitor section gives you access to three main items: Trends, Port Status, and [more…]

Cisco Networking: Switch Management Interface Configuration

Before you can manage your Cisco switch, you need to configure a management interface. Unlike the routers that allow for management on any configured interface, with switches you are not able to associate [more…]

How Virtual Local Area Networks (VLANs) Work

The magic of how virtual local area networks(VLANs) work is found in the Ethernet headers. When a switch receives an Ethernet frame, the frame will either already have a VLAN tag or the switch will insert [more…]

Setting up Virtual Local Area Networks (VLANs)

To create a Virtual Local Area Network (VLAN) on your switch, you can type only one command in Global Configuration mode: set vlan VID, which puts the switch into VLAN Configuration mode. However, typically [more…]

Configuring a Range of Switch Interfaces

Configuring a range of interfaces or ports on your switch prevents you from having to configure each of these interfaces individually. Putting your switch into Interface Range Configuration mode allows [more…]

Getting Started with VLAN Trunking Protocol (VTP)

VLAN Trunking Protocol (VTP) is a Cisco network protocol that propagates the definition of Virtual Local Area Networks (VLAN) on the whole local area network. Ensuring that all VLANs are configured on [more…]

VLAN Trunking Protocol (VTP) Configuration Revision Number Management

The VLAN Trunking Protocol (VTP) revision numberis important because it determines which updates are to be used when not managed properly this number can cause the deletion of all your networks VLAN information [more…]

VLAN Trunking Protocol (VTP) Tree Optimization

The initial configuration built by VLAN Trunking Protocol (VTP) should be reviewed and managed, or strategically pruned to optimize network traffic. VTP solves one problem for you — and immediately creates [more…]

VLAN Trunking Protocol Configuration

You must do a few things to configure VTP. You need to configure a port on your switch as a trunk; then you need to enable VTP. You use three operating modes with VTP that you designate in Global Configuration [more…]

Viewing Your VLAN Trunking Protocol (VTP) Settings

VLAN Trunking Protocol (VTP) changes the VLAN database of your switch; therefore, you will not see VTP settings in your running configuration. This is sometimes confusing because whenever you make changes [more…]

How Spanning Tree Protocol (STP) Manages Network Changes

What happens when you connect a new hub or switch to a Spanning Tree Protocol (STP) mapped network? For this example a hub was connected a hub to a port on both switch 11:99 and switch 77:22. A hub was [more…]

Effect of a Network Loop

So what happens when there is a loop on your Cisco network and you do not have spanning tree running? Well, if you have no network traffic on your network, then nothing. If you have a hub-based network [more…]

Setting Up Spanning Tree Protocol (STP)

All switches from Cisco ship with Spanning Tree Protocol (STP) enabled by default, but if STP is misconfigured for any reason, you can easily enable it. To enable spanning tree, connect to your switch [more…]

Spanning Tree Protocol (STP) and PortFast

The time Spanning Tree Protocol (STP) takes to transition ports over to the Forwarding state can cause problems. PortFast is a Cisco network function which can be configured to resolve this problem. [more…]

Troubleshooting Spanning Trunk Protocol (STP)

The first part of troubleshooting Spanning Tree Protocol (STP) is to gather additional information about the running protocol. Our good buddy show will get you started. If you have read other chapters [more…]

Debugging Spanning Trunk Protocol (STP)

You can collect specific debug information for a number of items related to Spanning Trunk Protocol (STP). Consider what you might want to see in your debug data. [more…]

Examining How EtherChannel Works

EtherChannel allows you to take ports on a Cisco switch and combine them to give you a larger data pipe. In this way, you can double, triple, even quadruple, the amount of data you send between two devices [more…]

EtherChannel Basic Restrictions

Rules, rules, rules, everything in the networking world has rules! EtherChannel is no different; it has a set of restrictions that dictate what you can and cannot do. Before running off to implement EtherChannel [more…]

EtherChannel Configuration

EtherChannel has been a part of the Cisco IOS for many years, so you should find that all your switches support it with proper configuration. Do not be afraid to enable it on a pair of ports and try it [more…]

Working with Cisco Discovery Protocol (CDP)

Cisco Discovery Protocol (CDP) is data link layer protocol that allows you to find information about the connections between devices. CDP is useful and easy to use, so you should start exploring a bit [more…]

Enabling and Disabling Cisco Discovery Protocol (CDP)

For a variety of reasons Cisco Discovery Protocol (CDP) may need to be enabled or disabled on portions of your network. CDP, when fully enabled, essentially allows you to identify Cisco devices on your [more…]

Examining Cisco Discovery Protocol (CDP) Output

Once you have Cisco Discovery Protocol (CDP) running and collecting data about your neighboring devices, you may want to view its output. This information about neighboring devices, is obtained by using [more…]

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