December 20, 2008  6:33 AM

Cisco Etherchannel Overview and how it can be configured in Cisco Catalyst Switches – Series 2



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 2960, Cisco 3560, Cisco 3750-E, Cisco 6500, Cisco Systems, Cisco Tips, Etherchannel, Etherchannel configuration, Etherchannel restrictions, Layer 2 Etherchannel, Layer 3 Etherchannel, Networking, Routing and Switching, Switches, Switching

Dear Friends, in my previous post I just introduced


December 13, 2008  6:27 AM

How to configure an interface to default settings in a Cisco Switch or a Cisco Router?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 2960, Cisco 3560, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco 6503, Cisco 877W Router, Cisco Catalyst 6503-E Switch, Cisco Catalyst 6506-E Switch, Cisco Catalyst 6509-E Switch, Cisco Catalyst 6509-V-E Switch, Cisco Catalyst 6513 Switch, Cisco IOS, Cisco Tips, Router Troubleshooting, Routers, Routing, Routing and Switching, Switches, Switching

This is a cool command to erase just the configuration for a particular interface in a Cisco Switch or a Cisco Router.

In the following example we will configure the interface fast Ethernet 0/9...


December 2, 2008  7:30 AM

How to configure SPAN(Switched Port Analyzer ) feature in a Cisco Catalyst Switch



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 2960, Cisco 3560, Cisco 3560-E, Cisco 3745, Cisco 3750-E, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco 6503, Cisco Catalyst 6503-E Switch, Cisco Catalyst 6506-E Switch, Cisco Catalyst 6509-E Switch, Cisco Catalyst 6509-V-E Switch, Cisco Catalyst 6513 Switch, Cisco IOS, Cisco Learning, Cisco Tips, Network Troubleshooting, Show commands, Sniifer, SPAN, Switches, Switching, Wireshark

It’s quite important for Network Engineers and an essential network troubleshooting technique to utilize the ability of Cisco Catalyst Switches


November 22, 2008  12:56 PM

How to configure DHCP Snooping in a Cisco Catalyst Switches.



Posted by: Yasir Irfan
802.1 Q, CCNP, Cisco, Cisco 2950, Cisco 2960, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco 6503, Cisco Catalyst 6503-E Switch, Cisco Catalyst 6506-E Switch, Cisco Catalyst 6509-E Switch, Cisco Catalyst 6509-V-E Switch, Cisco Catalyst 6513 Switch, Cisco IOS, Cisco Learning, Cisco Systems, Cisco Tips, Configuring DHCP Snooping, DHCP, DHCP Snooping, HSRP, IOS commands, Networking, Routing and Switching, Server Security, Switches, Switching, Trunk Ports

 So here we go, with the configuration of DHCP snooping on a Cisco Switch. This feature protects the network by allowing the Cisco Switches to accept DHCP response message only from the authorized servers connected to the trusted interfaces in a Cisco...


November 22, 2008  7:22 AM

Why should we consider implementing DHCP Snooping?



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 2960, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco 6503, Cisco Systems, Cisco Tips, DHCP, DHCP Snooping, Err-disable, Networking, Security, Switches, Switching

Dear FriendsIn my previous post I was discussing about the


September 8, 2008  8:12 AM

How to reset/delete the password & configuraton on a Cisco WS-C350-48-SMI



Posted by: Yasir Irfan
Cisco, Cisco 2950, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco Tips, HyperTerminal, IOS commands, Password reset, Switches

This article...


August 30, 2008  5:16 AM

A cool tool to solve layer 1 UTP cable issues in Cisco Catalyst Switches.



Posted by: Yasir Irfan
Cisco, Cisco 3560, Cisco 3560-E, Cisco 3750-E, Cisco Learning, Cisco Tips, IOS commands, Layer 1 issues, Network Troubleshooting, Switches

Here is a simple and cool tool for solving layer 1 UTP cable issues in a Cisco Catalyst Switches, the command used for this function is "test cable-diagnostics tdr interface" Here is the example MBGF-DAC-3560-AS01#test cable-diagnostics tdr interface gigabitEthernet 0/1 TDR test started on...


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 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,...


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