Examples MSTP has a special effect, referred to CIST (Common and Internal Spanning Tree) , i.e., the public and Internal Spanning Tree, referred to other examples MSTI (Multiple Spanning Tree Instance), i.e. MSTI. Composed by a single CIST spanning domain and computing MSTP STP / RSTP calculated obtained, is to ensure that all the bridged LAN is a simple and fully connected. Is connected to a single spanning tree for all switching devices within the network, together constitute the IST and the CST.
From the above, from the view range includes, IST is the smallest, only the internal part of an MST region, followed CST, is MST MSTI interconnection between the regions, and the maximum CIST, including the IST and the CST.
Reproduced in: https: //blog.51cto.com/14216988/2409713