What is a major difference between PVST and PVST+?
A.
PVST supports dot1q and PVST+ does not.
B.
PVST+ supports 802.1q and ISL.
C.
PVST supports only 802.1q and doesn’t support ISL
D.
PVST+ is an enhancement to the 802.1Q specification and is not supported on non-Cisco devices and PVST uses ISL Trunking.
It,s good but i need more
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I need more because i cannot understand proprely.Can you send me deeply
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The difference between PVST and PVST+ is relative to the standard 802.1q.
So let’s try to briefly define each one the mentioned concepts :
802.1q (standard) supports only one single instance of STP
native VLAN (Common Spanning Tree) – (let’s say channel 1)
one STP instance – (let’s say channel 2)
PVST (Cisco proprietary)
Support one STP instance per each VLAN
uses ISL trunk only.
Doesn’t support 802.1q
PVST+ (Cisco proprietary) Enhance PVST capabilities by allowing to transport PVST over 802.q :
native VLAN over “Common Spanning Tree” (over channel 1)
Each per-VLAN STP is encapsulated using a special Multicast MAC and transported (over channel 2)
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