Because the MSTP BPDU carries information for all instances, the number of BPDUs that need to be processed by a switch to support multiple spanning-tree instances is significantly reduced.Īll MST instances within the same region share the same protocol timers, but each MST instance has its own topology parameters, such as root switch ID, root path cost, and so forth. The IST is the only spanning-tree instance that sends and receives BPDUs all of the other spanning-tree instance information is contained in M-records, which are encapsulated within MSTP BPDUs. All other MST instances are numbered from 1 to 15. Instance 0 is a special instance for a region, known as the internal spanning tree (IST). Within each MST region, the MSTP maintains multiple spanning-tree instances. ¢An internal spanning tree (IST), which is the spanning tree that runs in an MST region. Unlike PVST+ and rapid PVST+ in which all the spanning-tree instances are independent, the MSTP establishes and maintains two types of spanning trees:
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