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Instances, the number of BPDUs that need to be processed to support Because the MST BPDU carries information for all Is contained in MSTP records (M-records), which are encapsulated All of the other spanning tree instance information The IST is the only spanning tree instance that sends and receives BPDUs. All other MST instances are numbered from 1 to 4094. Instance 0 is a special instance for a region, known as
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Within each MST region, MST maintains multiple spanning tree instances. Instances are independent, MST establishes and maintains IST, CIST,Īn IST is the spanning tree that runs in an MST region. Unlike other spanning tree protocols, in which all the spanning tree It all makes a lot more sense with the diagrams. Represent the entire MST region as a CST virtual bridge to the outside The IST instance receives and sends BPDUs to the CST. The IST instance is simply an RSTP instance that For 802.1q, a bridged network only implements a single Interact with 802.1q-based networks, because 802.1q is another IEEE In order to clearly understand the role of the IST instance, remember Switches placed under a common administration. Think of a region as the equivalent ofīorder Gateway Protocol (BGP) Autonomous Systems, which is a group of The IEEE 802.1s committee adopted a much easier and simpler approach This document has multiple, colored diagrams, and a pretty good explanation of terms. You jumped ahead to configuring MST instead of reading the Cisco documentation describing MST, Understanding Multiple Spanning Tree Protocol (802.1s). What happens when an ISL inside a region drops? What happens when an ISL between regions drops? Which parts of the network will recompute their topology and why?
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Same as an IST inside an MST region, and the same as a CST outside anĪn MST region looks like a single switch to the CIST. So here we are in order to make things clear once and for all.Ī CIST is a collection of the ISTs in each MST region. I have the feeling the more I read about MSTP, the more confused I get.