Running debug commands can bring a busy router to a crawl. Not sending the output to the console can help. This tech-recipe describes turning off console debugging output and techniques for viewing debug information in a router-friendly way.
Category Cisco router
A couple of new commands to make life easier with IP Telephony using Cisco CallManager and CallManager Express.
Connect a Cisco switch and router via 802.1q trunking. This configuration is known as a router-on-a-stick.
In system>server, the default name for each server is its hostname. These names will be passed along to the phones, requiring a DNS lookup before a phone can contact CallManager.
This Tech-Recipe describes using an external DHCP server, in this case from a Windows Server 2000 or 2003 system, with Cisco Call Manager (CCM). When introducing CCM into environments with an exsiting DHCP infrastructure, problems may occur because Cisco IP phones require additional information from the DHCP server when they startup. Following the steps in […]
Category Cisco networking
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 […]
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.
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 is how to configure a new VLAN on a 2900 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.