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Re: Re: VLAN 1, if not used, is safe to shutdown (trunk disallow) always ? posted 12/27/2006
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It looks like in Cisco PVSTP+ it sends BPDUs with tags and without tags (duplicate packets).

So, when all switches are Cisco it is pretty safe to disallow vlan 1, if STP is in concern.

Next question is if it is still safe with MSTP.