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Dangers of global port tagging

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Last Modified: 2014-01-13
We have dozens of switches around our sites. We use VLAN 3 for VoIP. It's becoming unmanageable tagging only those ports which have VoIP devices plugged into them as, invariably, the socket designation on the wall/patch panel unavoidably differs from the port number on the switch.

What are the dangers of simply tagging ALL ports with this VLAN, given that less than 10% of them will ever have a device plugged in which can make use of that traffic?

Thanks in advance.
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