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Line 127: A [[Virtual LAN\|VLAN]] can only be mapped to one [[Multiple_Spanning_Tree_Protocol#Multiple_Spanning_Tree_Instances_.28MSTI.29\|MSTI]] or to the [[Multiple_Spanning_Tree_Protocol#Common_and_Internal_Spanning_Tree_.28CST.2FCIST.29\|CIST]]. One [[Virtual LAN\|VLAN]] mapped to multiple spanning trees is not allowed. All the [[Virtual LAN\|VLANs]] are mapped to the [[Multiple_Spanning_Tree_Protocol#Common_and_Internal_Spanning_Tree_.28CST.2FCIST.29\|CIST]] by default. Once a [[Virtual LAN\|VLAN]] is mapped to a specified [[Multiple_Spanning_Tree_Protocol#Multiple_Spanning_Tree_Instances_.28MSTI.29\|MSTI]], it is removed from the [[Multiple_Spanning_Tree_Protocol#Common_and_Internal_Spanning_Tree_.28CST.2FCIST.29\|CIST]].To avoid unnecessary [[Spanning_Tree_Protocol\|STP]] processing, a [[Port (computer networking)\|Port]] that is attached to a [[Local area network\|LAN]] with no other bridges/switches attached, can be configured as an edge port.<br /><br /> An example of how to configure a simple, three switch SMTP topology wherein a layer-two access switch carries four [[Virtual LAN\|VLANs]] and has two uplinks to two distribution switches, can be found here: [http://packetlife.net/blog/2010/apr/26/multiple-spanning-tree-mst/ MSTP Configuration Guide]<br /> A good configuration view, from the ~~mentioned-~~aboved-mentioned example shall be: S3# '''show spanning-tree mst'''

Multiple Spanning Tree Protocol: Difference between revisions