CISSP06's tutorials

Disable or turn off CDP on Cisco switches

Contributed by CISSP06 on August 12, 2006 under Cisco switch

Cisco Discover Protocol or CDP is a Cisco-proprietary protocol that runs on all Cisco products. CDP allows devices to learn about neighboring devices (the ones attached directly to the switch) including information about their platform, IP address, the version of IOS or other OS, VLAN membership, etc. This can be helpful information when troubleshooting network issues, it can also provide an attacker valuable information about the layout of your network. Other vulnerabilities include a denial of service attack in which CDP packets are generated, flooding the network. If you want to know how to turn off CDP, read on.

Comments Continue reading... 
 

Cisco 2950 Switch: Create a VLAN

Contributed by CISSP06 on July 28, 2006 under Cisco switch

The commands for creating a VLAN vary from one switch model to another. VLANs in a 2950 switch are configured in a manner similar to configuring an interface. This configuration is substantially different than a 2900 switch.

Comments Continue reading... 
 

Cisco 2900 Switch: Create a VLAN

Contributed by CISSP06 on under Cisco switch

A VLAN (Virtual Local Area Network) makes a single physical switch behave like several separate switches. A host connected to one VLAN cannot communicate through the switch to a host connected to another (although a router can permit communication between VLANs if desired). Here’s how to configure a new VLAN on a 2900 switch.

Comments Continue reading... 
 

Cisco Switch 2900/2950: Display VLAN information

Contributed by CISSP06 on under Cisco switch

Knowing the commands to display configuration information about Virtual LANs (VLANs) is as important as knowing the commands to configure them. The commands here display information about all VLANs or a single VLAN by number or name.

Comments Continue reading...