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QID:BCM326
#1
Is PVST+ an extension to 802.1Q as H2P says or to 802.1d?

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#2
Per VLAN Spanning Tree Plus (PVST+) provides the same functionality as PVST using 802.1Q trunking technology rather than ISL. PVST+ is an enhancement to the 802.1Q specification and is not supported on non-Cisco devices.

referance link: http://www.cisco.com/en/US/tech/tk389/tk..._home.html
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