Network technologies and trends:

Routing and Switching


May 31, 2010  1:18 PM

CCIE Routing and Switching v4.0 Configuration Practice Labs in eBook format



Posted by: Yasir Irfan
CCIE, CCIE Labs, CCIE Practicals, CCIE Routing and Switching v4.0 Configuration Practice Lab, Cisco Press, Cisco Press Release, Routing and Switching

Recently Cisco Press released the CCIE Routing and Switching v4.0 Configuration Practice Labs in...

November 17, 2009  6:38 AM

How to disable SSH in Cisco Devices?



Posted by: Yasir Irfan
Cisco Commands, Cisco Networking, Cisco Router, Cisco Switch, Cisco Tips, Cisco-remote-access, crypto key zeroize rsa, Disable SSH, disable SSH in Cisco routers, disable SSH in Cisco Switches, enable SSH, How to disable SSH in Cisco devices, Network Technologies and Trends, remote access, Router Configuration, Routing and Switching, SSH, ssh disable, ssh enable, ssh reconfigure, Switch Configuration

We all know the importance of SSH, and it is one of most used method for remote access of Cisco Devices either it might be a Cisco Router or a Cisco Switch. Most of the...


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 15, 2008  6:55 AM

Cisco Etherchannel Overview and how it can be configured in Cisco Catalyst Switches – Series 1



Posted by: Yasir Irfan
10 GigaEtherchannel, 802.3ad, Cisco, Cisco 6500, Cisco IOS, Cisco Tips, Etherchannel, Etherchannel configuration, IEEE, Kalpana, Layer 2 Etherchannel, Layer 3 Etherchannel, Networking, Routing and Switching, Switches, Switching, Switching Secrets

Dear Friends in this upcoming series of posts I would like to concentrate on Etherchannel


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 3, 2008  5:58 AM

Switching Secrets for Multimedia by TechWise TV



Posted by: Yasir Irfan
Cisco Events, Cisco Learning, Cisco News, Cisco Systems, Cisco Virtual Switching System, Netflow, PISA, Routing and Switching, Switches, Switching, Switching Secrets, TechWise TV, VSS

Dear Friends here is one more opportunity from Cisco Systems TechWise TV which reveals how to use the techniques, tools and innovations you might already have to effectively support rich communication and full service video without adding...


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 17, 2008  5:16 AM

In which slot shall we install the Supervisor Engine in Cisco 6500 Series Catalyst Switches -Series2



Posted by: Yasir Irfan
Cisco, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco Catalyst 6506-E Switch, Cisco Systems, Cisco Tips, Network Troubleshooting, Routing and Switching, SUP720, Supervisor Engine, Switches, Switching

Dear Friends in one of my previous post


November 12, 2008  12:56 PM

Solution for %IP-4-DUPADDR: Duplicate address error log in your Cisco 6500 Switches running HSRP



Posted by: Yasir Irfan
Cisco, Cisco 6500, Cisco 6500 Series Catalyst Switch, Cisco Catalyst 6513 Switch, Cisco IOS, Cisco Learning, Cisco Support, Cisco Systems, Cisco Tips, Hot Standby Router Protocol, HSRP, Network Troubleshooting, Routing and Switching, Switches, Switching, TAC, WebEx

Dear Friends In


November 9, 2008  6:51 AM

Don’t panic whenever you see %IP-4-DUPADDR: Duplicate address error log in your Cisco 6500 Switches running HSRP



Posted by: Yasir Irfan
Cisco, 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 Systems, Cisco Tips, Hot Standby Router Protocol, HSRP, Network Troubleshooting, Networking, Routing and Switching, Switches, Switching, Trojan

If you are running HSRP and one of your VLAN is down and the following errors are generated in your Switch don’t panic. All this happens due the Trojans in the network.

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