STRIDE SE-MC2U-SC, User Manual

Page: 105 / 230

Spanning Tree Port Settings
Each port can be configured to tune the STP/RSTP/MSTP spanning tree. With MSTP, each
spanning tree instance can be tuned independently.
Using MSTP, you can configure separate port settings for the CIST (Common Internal
Spanning Tree) and for every spanning tree created by MSTP. Settings for individual MSTIs
(Multiple Spanning Tree Instances) only affect ports connected to switches within the same
MSTP Region.
By default, MSTIs inherit their settings from the CIST. To configure an MSTI individually,
you must select it from the drop-down box and click the Customize button for the instance.
Click Inherit if you want a spanning tree’s values to be inherited from the CIST again.
Exclude (Default = Included):
Normally all ports should be included in determining the
Spanning Tree network topology, either as a normal port or an edge port. It is possible to
completely exclude a port, so that it will always forward network traffic and never generate or
respond to network messages for RSTP or STP. Excluding a port is an advanced option that
should be used only if absolutely necessary. The pair of ports assigned to a Real-Time Ring
should be excluded from Spanning Tree.
This option excludes the port from all spanning tree instances and appears with the other
CIST settings.
Port Priority (0 to 240; Default = 128): Selection of the port to be assigned “root” if two
ports are connected in a loop is based on the port with the lowest port priority. If the root
bridge fails, the bridge with the next lowest priority then becomes the root.
4-21
Chapter 4 - Managed Switch Software Setup
Stride Industrial Ethernet Switches User Manual 2nd Ed. Rev. A