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12.17.2007 at 10:45AM PST, ID: 23028670
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8.4

Voice VLAN Options(dot1p, untagged, none)

Asked by dis1931 in Voice Over IP, Network Routers, Network Switches & Hubs

Tags: , ,

I am trying to make sense of the different voice vlan options...

"switchport voice vlan {vlan-id | dot1p | untagged | none}"

The vlan-id option is used to specify a specific VLAN to use for voice traffic.  Data traffic remains in native vlan.  Uses 802.1p for Voice QoS.

The dot1p option is similar to the vlan-id option except it uses VLAN 0 for voice traffic. Data traffic remains in native vlan.  Uses 802.1p for Voice QOS.

The untagged option places the voice packets on the native vlan.  However, it seems to form a special 802.1Q trunk just like the dot1p and vlan-id options.  Not sure if it uses 802.1p for Voice QoS or if no Voice QoS is used.

The None option places the voice packets on the native vlan and no special 802.1q trunk is formed.  I would assume that since there is no trunk there is no differentiation between the traffic and hence 802.1p cannot be used so there is no Voice QoS taking place.

Above is how I understand it.  So my question is what is the difference between "untagged" and "none"?  

Does Untagged actually use 802.1p for Voice QOS?  

If Untagged does use 802.1p for Voice QoS then what is the difference between using dot1p and untagged?  They would be the same except that Voice traffic would be on VLAN 0 instead of the native VLAN.  However, what advantage is it if they both can carry QoS.  I guess there would be some security gained from using VLAN 0.

I am trying to grasp what the real difference is and what the pros and cons are for each option.  I am a beginner on this topic so any help would be appreciated.Start Free Trial
[+][-]12.17.2007 at 11:02AM PST, ID: 20486962

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[+][-]12.17.2007 at 02:37PM PST, ID: 20488572

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[+][-]12.18.2007 at 06:53PM PST, ID: 20497239

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[+][-]12.18.2007 at 06:53PM PST, ID: 20497240

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[+][-]12.19.2007 at 06:54AM PST, ID: 20499892

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[+][-]12.27.2007 at 12:17PM PST, ID: 20536808

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[+][-]12.27.2007 at 02:50PM PST, ID: 20538016

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About this solution

Zones: Voice Over IP, Network Routers, Network Switches & Hubs
Tags: vlan, voice, untagged
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Solution Provided By: rpalmeira22
Participating Experts: 2
Solution Grade: A
 
 
[+][-]12.27.2007 at 02:51PM PST, ID: 20538023

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