Mstp Structure - HP 3500 Series Advanced Traffic Management Manual

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In a mesh environment, the default MSTP timer settings (Hello Time and

Forward Delay) are usually adequate for MSTP operation. Because a packet

crossing a mesh may traverse several links within the mesh, using smaller-

than-default settings for the MSTP Hello Time and Forward Delay timers can

cause unnecessary topology changes and end-node connectivity problems.

For MSTP information beyond what is provided in this manual, refer to the

IEEE 802.1s standard.

MSTP Structure

MSTP maps active, separate paths through separate spanning tree instances

and between MST regions. Each MST region comprises one or more MSTP

switches. Note that MSTP recognizes an STP or RSTP LAN as a distinct

spanning-tree region.

Running RSTP

Running RSTP

Figure 3-2. Example of MSTP Network with Legacy STP and RSTP Devices

Multiple Instance Spanning-Tree Operation

802.1s Multiple Spanning Tree Protocol (MSTP)

Common and Internal Spanning Tree (CIST)

Common Spanning Tree (CST)

Running RSTP

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