From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Thu Jun 28 2007 - 05:12:13 ART
Simply put, PVST+ is a PVST implementation over 802.1q trunks, that
interoperates
with 802.1q CST spanning-tree implementations.
PVST+ intends to "tunnel" PVST per-VLAN BPDUs through a "cloud" of
802.1qbridges
using special multicast MAC address, and at the same time, keeping in touch
with 802.1q
CST.
So there is no actual difference in configuring these, they only differer
in operations.
PVST encapsulation/logic is used over ISL trunks, and PVST+ encapsulation
(differers a little from standard 802.1d) and logic is used over
802.1trunks. You can
check out how PVST+ works on 802.1q trunk here:
http://puck.nether.net/pipermail/cisco-nsp/2004-March/009079.html
HTH
-- Petr Lapukhov, CCIE #16379 (R&S/Security/SP) petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com
2007/6/28, thomas.rader@freesurf.ch <thomas.rader@freesurf.ch>: > > Hello, > > I'm confused about PVST vs PVST+ > > Cisco talks about these as if they were seperate implementations (PVST+ > provides the same functionality as PVST using 802.1q instead of ISL). > > However I can only find one method of PVST configuration in the CLI and > most of the documentation. > > Am I to assume that when Cisco talks about PVST they are actually talking > about PVST+ ? > > > Per VLAN Spanning Tree (PVST) > > http://www.cisco.com/en/US/tech/tk389/tk621/tk846/tsd_technology_support_sub-protocol_home.html > > Per VLAN Spanning Tree Plus (PVST+) > > http://www.cisco.com/en/US/tech/tk389/tk621/tk847/tsd_technology_support_sub-protocol_home.html > > > Thanks, Thomas > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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