Solved: Per-VLAN Spanning Tree

amolak_cisco · ‎05-09-2007

Hi Guys,

I want to clear one doubt, please help on this.

Cisco says," Per-Vlan Spanning tree(PVST) is a Cisco properietary version of STP. Due to its proprietary nature, PVST requires the use of Cisco Inter-Switch Link(ISL) trunking encapsulation between switches.

But I think PVST can be used with the IEEE 802.1Q trunking encapsulation.

Please comment.

Thanks

Amolak

Jon Marshall · ‎05-09-2007

Hi Amolak

PVST does only work with ISL. PVST+ is an enhancement of PVST that was designed to work with 802.1q.

HTH

Jon

View solution in original post

ankbhasi · ‎05-09-2007

Hi Amolak,

Cisco developed PVST+ in order to allow running several STP instances (even over an 802.1Q network).

PVST is not supported on dot1q links.

http://www.cisco.com/warp/public/473/27.html#spanning

HTH

Ankur

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