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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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#### IST, CIST, and CST

The IST runs in an MST region. Within each MST region MSTP maintains multiple STIs. Instance 0 is known as IST. All other instances are numbered from 1 to 15. The IST is the only spanning tree instance that sends and receives the MST configuration messages, all other instance information are encapsulated in MST BPDUs. Thus, in MSTP there are two contexts of operation, one in the context of the entire topology called CIST and the other in the context of the each individual spanning tree context, that is, MSTI.

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