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12/02/2008 at 10:21AM PST, ID: 23950627
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8.1

Cisco IOS question related to CDP, voice VLAN autoconfiguration, and having voice and data on the same port

Asked by carnesc in Voice Over IP, Network Switches & Hubs

Tags: Cisco, IOS, 12.2x, Catalyst 3750 & 3560 voice and data VLAN configurations

Environment:

Catalyst 3750s and 3560s
Multiple data VLANs, dedicated voice VLAN
Polycom IP phones, support CDP

Questions:

1. Given a single switch port configured for both an access and voice VLAN, why is the voice VLAN not detected unless CDP is enabled on the phone? What is CDP doing exactly?

2. Right now, I have to manually configure a switch port for both a data and voice VLAN for a phone and computer to work on the same line. The phone is always placed inline between the switch and the end computer. If a switch port is configured like this, though, the computer will not communicate on the LAN without the phone present. Also, adding the voice VLAN manually is required when a phone is introduced on a working data port where a phone had never been.

Is there a way to automate addition (and removal) of the voice VLAN command on a given port? In other words, given an already configured data port, how can addition and removal of a phone be made seamless so as to require no administrative intervention? I am seeking ease of administration but am also interested in learning potential security implications of auto configuration.

3. Security consideration for CDP specifically?

4. Any other ideas about how to streamline a musical phone scenario?

Thanks!
[+][-]12/02/08 11:03 AM, ID: 23079708

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[+][-]12/03/08 06:02 AM, ID: 23085894

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[+][-]12/03/08 06:35 AM, ID: 23086177

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About this solution

Zones: Voice Over IP, Network Switches & Hubs
Tags: Cisco, IOS, 12.2x, Catalyst 3750 & 3560 voice and data VLAN configurations
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Solution Provided By: ChopperCentury
Participating Experts: 2
Solution Grade: B
 
 
[+][-]12/03/08 01:43 PM, ID: 23090575

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[+][-]12/03/08 01:51 PM, ID: 23090649

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[+][-]12/03/08 01:54 PM, ID: 23090675

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[+][-]12/03/08 01:55 PM, ID: 23090693

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[+][-]12/05/08 08:02 AM, ID: 23105839

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