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What is the performance impact of VLAN tagging with Cisco Catalyst 3750G. Is the slowdown noticeable ?

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I'm not sure about that specific switch, but generally VLAN tagging is done in hardware when the packet is switched, so should not be a performance impact at all.

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  • Thanks for the answer Mike. I though the same that there is no impact on perforfmance but wanna be sure. I need to implement tagging on vmware environment
    – Alan Kuras
    Sep 29, 2011 at 17:40
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    @Alan: of course, if you are going to trunk many VLANs on the same connection, the total bandwidth will be shared between them; other than that, tagging per se should have no impact at all.
    – Massimo
    Sep 29, 2011 at 20:12
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I can confirm mike answer, tagging is done by ASICs and have almost no impact on performance

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