Network technologies and trends:

Cisco 2950


August 24, 2008  6:20 AM

How to reset the Cisco Catalyst Switch to Factory Defaults



Posted by: Yasir Irfan
Cisco 2950, Cisco 6500, Cisco Learning, Cisco Tips, Network Troubleshooting, Networking, Switches

To reset the Cisco Catalyst switches to factory defaults, you need access to the Cisco Catalyst Switch console through either a physical console or a Telnet connection. You also need the console/enable passwords. If you forget the console and...

August 23, 2008  6:04 AM

Discover Cisco Network Assistant (CNA)



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco Network Assistant, Cisco Tips, Network Inventory, Network Troubleshooting, Networking, Routers, SNMP, Switches

Cisco Network Assistant (CNA) is a PC-based graphical network management application which is free tool included when a new Cisco Switch is...


August 20, 2008  6:22 AM

What is Service timestamps logging, and how it can be configured Cisco Switch or a Router?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3745, Cisco 6500, IOS commands, Router Troubleshooting, Service timestamp, Switches, Syslog

Logging is a quite essential part of a secure network configuration. Logging not only helps the Network Administrators to identify the issue while troubleshooting, also enables them to react to intrusion attempts or Denial-of –Service attacks....


August 17, 2008  5:55 AM

What is the Link-flap error in Cisco Switches?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 6500, Err-disable, Layer 1 issues, Link-Flap, Switches

Link flap means that the interface continually goes up and down in a Cisco Switch. The interface is put into the errdisabled state if it flaps more than five times in 10 seconds. The common cause of link flap is a Layer 1 issue such as a bad cable,...


August 2, 2008  6:43 AM

Show Commands in Cisco Routers and Layer 3 Switches(Most commonly used)Series -1



Posted by: Yasir Irfan
ASA/PIX, Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 525, Cisco 6500, Cisco Tips, IOS commands, PIX 525, Router Troubleshooting, Routers, Show commands, Switches

Some of the widely used commands in Cisco routers are just simple unavoidable, among the most commonly used commands in a Cisco Routers are “show” commands. These commands are essential to Network Administrators. Here is a list of those commands. I...


July 30, 2008  12:59 PM

Network Inventory and Configuration Management



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3745, Cisco 6500, Cisco Tips, Configuration Management, Network Inventory, Networking, Open Source, Routers, SNMP, Switches, ZipTie

We all know much about Kiwi Syslog Software.  For many years I am using Kiwi Cat tools for configuration management and automate many of daily tasks. Kiwi Cat tool really helped me to perform many tasks like configuration backup, telnet, SSH and much more....


July 20, 2008  8:53 AM

How to configure multiple interfaces in Cisco Switches



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 525, Cisco Tips, Networking, Switches

Configuring individual interfaces with same parameter on a Cisco Switch can be time consuming. In order to overcome this you can use following commands, from the global mode enter config t ITKE#configure t ITKE(config)# then issue interface range fastEthernet 0/1 -24 ITKE(config)#interface...


July 17, 2008  9:45 PM

How to display the configuration of a single interface in Cisco Router or a Switch



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco Learning, Cisco Tips, Networking, Routers, Switches

Displaying configuration of a single interface can be a time-consuming task if your router or a switch  has extremely long configuration. In this case, the interface keyword of the show running-config command becomes extremely useful. For example, the show running-config interface serial 0/1 ...


July 15, 2008  6:36 AM

How to Secure SNMP in Cisco Switches and Routers



Posted by: Yasir Irfan
Access List, Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco Learning, Cisco Tips, Networking, Routers, SNMP, Switches

This article focus on the ways how we can secure SNMP access in Cisco Switches and Routers Simple Network Management Protocol (SNMP)   uses the default UDP port 161 for general SNMP messages and UDP port 162 for SNMP trap...


July 7, 2008  10:47 AM

Cisco Catalyst Switches are Certified Green!



Posted by: Yasir Irfan
Certfied Green, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Switches

I was just browsing Cisco website and figured out Cisco happens to be the first company to achieve the new certification, Certified Green by Miercom. Just to brief you about Miercom is a leading network product test center and consultancy firm. The...


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