Spanning-tree

Unanswered Question
May 2nd, 2008

Hello,


I am trying to understand all the spanning-tree options but they are difficult to classify.


For all of the following: CST, MST, PVST, PVST +, MISTP, are these options part of the STP or RSTP protocol or both?


Do you know the difference between PVST and PVST +? And I found nothing on CST ou MISTP mode? Do you know some?


Thank you

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Jon Marshall Fri, 05/02/2008 - 03:10

Claude


This is how i understand it.


CST = Common Spanning Tree ie. you have one spanning tree instance for the whole switch network regardless of how many vlans there are.


PVST = Per vlan Spanning Tree. Unlike CST each vlan can run it's own instance of Spanning-tree. PVST is used on ISL trunks.


PVST+ same as PVST but for 802.1q trunks.


RSTP - an improvement on STP that incorporated many of the proprietary features that Cisco had with normal STP ie. uplinkfast, backbonefast.


MST = MISTP - MST uses RSTP but allows you to group a number of vlans to one spannning-tree instance.


Jon

Actions

This Discussion