Cisco Networking

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Debug Options for Cisco Discovery Protocol (CDP)

As with all other protocols, Cisco Discovery Protocol (CDP) has specific debug commands that can help you to identify errors or problems with the protocol. You can display debugging information for the [more…]

Documenting Your Cisco Network Configuration with CDP

Documenting a Cisco network configuration sometimes without Cisco Discovery Protocol (CDP) can involve hours in wiring closets tracing cables and documenting ports. In some cases, the wiring closet is [more…]

Virtual Local Area Network (VLAN) Basics

Virtual LANs (VLANs) are a solution to allow you to separate users into individual network segments for security and other reasons. VLAN membership can be configured through software instead of physically [more…]

Spanning Tree Protocol (STP) and VLAN Interaction

You may encounter an issue when implementing a VLAN on a network which supports Spanning Tree Protocol (STP); STP was built to interact with only one VLAN. [more…]

Spanning Tree Protocol (STP) Introduction

Spanning Tree Protocol (STP) was developed before switches were created in order to deal with an issue that occurred with networks that were implementing network bridges. STP serves two purposes: First [more…]

Identifying Features of a WAN

Sometimes people mistakenly want to identify a Wide-Area Network (WAN) by the size of the network or by the devices that compose the network. For example, if your network has 5,000, devices and you are [more…]

Local Area Network (LAN) Types

A WAN is a type of Local Area Network (LAN). A LAN is a private network that typically is made up of a well-connected, reliable, and fast network connection. Alternatives on the LAN framework include CANs [more…]

Choosing Network Technologies: Physical Connection

In almost every physical network connectivity option, you will be using a router to act as the boundary between your network devices and the devices that belong to the telephone company. In many cases [more…]

Routing Information Protocol (RIP)

Routing Information Protocol (RIP) as a routing protocol is based on methodologies that go back to the beginning of TCP/IP routing with the formation of the ARPANET, which is the precursor of what is now [more…]

Enhanced Interior Gateway Routing Protocol (EIGRP)

Enhanced Interior Gateway Routing Protocol (EIGRP) is an update to Cisco's now obsolete Interior Gateway Routing Protocol (IGRP). The original protocol was built to overcome issues in Routing Information [more…]

Open Shortest Path First (OSPF) Routing Protocol

Open Shortest Path First (OSPF) is a link-state routing protocol, rather than a distance vector protocol. The main difference here is that a linked-state protocol [more…]

Intermediate System to Intermediate System (IS-IS) Routing Protocol

Intermediate System to Intermediate System (IS-IS) is link-state routing protocol, and its technical information is found in RFC1142. It was developed by Digital Equipment Company for DECNet at the same [more…]

Border Gateway Protocol (BGP) Routing Protocol

Border Gateway Protocol (BGP) is one of the core routing protocols used by most of the service providers on the Internet. Most core routing decisions on the Internet are made by BGP. The current version [more…]

Network Router Overview

Routers are physical devices that join multiple wired or wireless networks together. Technically, a wired or wireless router is a Layer 3 gateway, meaning that the wired/wireless router connects networks [more…]

Examining the Routing Process

The routing process starts with a source computer that makes the first decision in the routing steps, which is illustrated below. Not shown in the figure is the implicit route that each router would have [more…]

Viewing a Router's Routing Table

Debugging problems with your router may require that you review the contents of the routing table. To view the routing table on your router, you connect to the command-line interface and type the following [more…]

Network Router Enablement

It may seem strange, but when you first enable your network router and configure IP addresses for its interfaces, the router will not actually route data. First, you must [more…]

Dynamic Host Configuration Protocol (DHCP) Services

Services that are not router-related are also available on your router — for example, the Dynamic Host Configuration Protocol (DHCP) service. You can use DHCP to hand out IP address configuration to devices [more…]

Dynamic Host Configuration Protocol (DHCP) Server Configuration

Dynamic Host Configuration Protocol (DHCP) is a protocol that handles the assignment of many IP parameters. Configuring your DHCP server is easy, involving only a few lines in your router's configuration [more…]

Observing Dynamic Host Configuration Protocol (DHCP) Traffic

To observe the traffic on your network in regard to Dynamic Host Configuration Protocol (DHCP), enable the following debugoptions. Though you can monitor several options [more…]

IP Helper Address Utilization

You can implement an IP Helper address to forward Dynamic Host Configuration Protocol (DHCP) broadcasts on to their appropriate destination. In this way, you can implement a single DHCP server as one management [more…]

Configuring EtherChannel Load Balancing

EtherChannel can use two methods for load balancing Cisco device connections, with the default load balancing based on the source MAC address of the system sending data. But because it is sometimes more [more…]

EtherChannel Diagnostic Information Gathering

To diagnose EtherChannel problems on a Cisco network, you first must be able to collect information about your switch and its configuration. To perform this task, you, as always, rely on the [more…]

Debugging EtherChannel

The basic debug command options for EtherChannel are listed here. As always with the debug command in a Cisco network, you can use specific options if you have an idea about where the issues are or can [more…]

Viewing Existing Smartport Macros

Smartport comes with a small number of default macros which can be applied to your Cisco network devices. To examine your existing Smartport macros, you use the ever-popular [more…]

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