This How To will explain the process to back up your IOS image. Your IOS image is stored as a file in the non-volatile memory of your switch or router. This image file is compressed to reduce its size and reduce the transfer times as much as possible. Before starting the procedure of IOS file […]
This How To addresses the method of limiting bandwidth on ports of a Cisco Switch or Router. Why should you limit bandwidth? There are a number of reasons for limiting bandwidth on a Cisco switch Ethernet port. For example, let’s say you work for an Internet service provider in a colocation facility, and you sell
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In our high level overview of QoS we stated that configuring QoS can be complicated. Cisco developed NBAR as the QoS ‘autopilot’ as one solution to this problem. More recently, Cisco has developed something called AutoQoS, which also configures QoS settings for you. You can use AutoQoS to a)create policies based on real-time traffic flowing
While RIP is not used for the ‘real’ Internet routing, and hasn’t been for many years, we often use RIP to do testing as it is so quick and easy to configure the protocol. Also, if you are learning shortest path routing for the first time, RIP is a great place to start as it
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This How To covers something called Black Hole Routing using the NULL interface in Cisco IOS. The entire YouTube network went down in 2009, across the globe, for about two hours — thanks to a mistake made by an ISP in Pakistan. That mistake involved a black hole route accidentally distributed around the world. While
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Generic Route Encapsulation is a tunneling technique in IP networking where a received IP packet is re-encapsulated in a second IP header (IP-in-IP) and sent across the network. It is like a Layer 3 VPN but alone it is not a secure VPN. You can encrypt GRE with an encryption protocol such as IPSec to
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A common misunderstanding with configuring Cisco routers is the meaning of the ‘bandwidth’ command. Following a recent discussion we had with a client we thought it appropriate to add some specifics to our Tech Tips area. Let’s say you have a serial interface between two Cisco routers and the interface is up and running with
In this How To we will explain the basics of SSH configuration on Cisco IOS. To start, we recommend you verify you have the correct IOS version that supports triple-DES and SSH. With that said, let’s jump in. First, make sure your router has a hostname by using the hostname command. Here’s an example: Router#
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The Web Cache Communications Protocol (WCCP) is used to redirect traffic (usually Web page requests) to another device in real time. The most common use for WCCP is redirecting Web traffic to a server that provides Web caching, filtering, or other services. You can enable WCCP on your router, but you should only use WCCP
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In this How To we will introduce the concepts of Quality of Service or QoS (kwas). Managing QoS is an important process and skill that everyone who runs a network needs to understand. We will introduce you to QoS principles at a high level. You will find details in other How To’s. First, lets understand
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This How To explains the process of upgrading IOS on a Cisco Router. Before starting the procedure of IOS upgrade or installation, you will need to install TFTP server software on a PC connected to the router Ethernet interface. There are many free downloadable TFTP servers’ software on the Internet. Afterwards, you make sure to
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This How To explains username configuration. Short and sweet. Step 1: With use of below command we can create User in Cisco Router Cell_Router(config)#username AWALDING priv 15 password CELLSTREAM Step 2: Also, we have to enable this at each line Cell_Router(config)# line con 0Cell_Router(config-line)#login local Cell_Router(config)# line vty 0 15Cell_Router(config-line)#login local Cell_Router(config)# line aux 0Cell_Router(config-line)#login local
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In this How To we will explain the procedure for Warm Upgrade and Reload. The examples are shown on a Cisco 2811 Router. The warm upgrade feature of the Cisco IOS was offered in Cisco IOS version 12.3(11)T. The warm reload feature of the Cisco IOS was offered in IOS version 12.3(2)T. What are the
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In this How To we will provide an overview of Smartports and how they can help with your Cisco switch administration. Cisco now calls these Auto Smartports. The Smartports macros can speed up deployment while ensuring accuracy and consistency on your switch ports. Simply put, Smartports macros are pre-created configuration scripts that work on most
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The ability to monitor your network traffic is critical for all network administrators and managers. This means getting down to the packet level. To get down to the packet level, you have to use a protocol analyzer that will dissect the packets and conversations that occur on the network. Most users are familiar with packet
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