Multiple Spanning Tree Protocol: Difference between revisions

Revision as of 11:02, 15 May 2018

Revision as of 11:24, 5 September 2018

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A VLAN can only be mapped to one MSTI or to the CIST. One VLAN mapped to multiple spanning trees is not allowed. All the VLANs are mapped to the CIST by default. Once a VLAN is mapped to a specified MSTI, it is removed from the CIST.To avoid unnecessary STP processing, a port that is attached to a LAN with no other bridges/switches attached, can be configured as an edge port.

An example of how to configure a simple, three switch SMTPMSTP topology wherein a layer-two access switch carries four 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 aboved-mentioned example shall be:

S3# '''show spanning-tree mst'''

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{{commons category|MSTP}}

* [http://standards.ieee.org/about/get/802/802.1.html IEEE "Home Page" for 802.1] (Related Standards of the 802.1 family)

* [http://blog.ine.com/2008/07/27/mstp-tutorial-part-i-inside-a-region/ MSTP Tutorial] (Brief Tutorial for the comprehension of SMTPMSTP)

* [http://www.postel.org/pipermail/rbridge/ RBridge]

* Cisco Implementations

** [https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html] (Cisco Implementation and brief tutorial about SMTPMSTP)

** [http://www.cisco.com/en/US/tech/tk389/tk621/tsd_technology_support_protocol_home.html Cisco home page for the Spanning-Tree protocol family] (discusses CST, MISTP, PVST, PVST+, RSTP, STP)

** [http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf Educational explanation of STP] www.cisco.com