Westermo MRI-128-F4G-PSE24 - Manual (Page 78)

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This page allows you to see the information of the root switch and port status.
Root Information: You can see root Bridge ID, Root Priority, Root Port, Root Path
Cost and the Max Age, Hello Time and Forward Delay of BPDU sent from the root
switch.
Port Information: You can see port Role, Port State, Path Cost, Port Priority, Oper
P2P mode, Oper edge port mode and Aggregated (ID/Type).
4.5.3 MSTP Configuration
MSTP is the abbreviation of Multiple Spanning Tree Protocol. This protocol is a
direct extension of RSTP. It can provide an independent spanning tree for different
VLANs. It simplifies network management, provides for even faster convergence
than RSTP by limiting the size of each region, and prevents VLAN members from
being segmented from the rest of the group (as sometimes occurs with IEEE
802.1D STP).
While using MSTP, there are some new concepts of network architecture. A switch
may belong to different groups, act as root or designate switch, generate BPDU for
the network to maintain the forwarding table of the spanning tree. With MSTP can
also provide multiple forwarding paths and enable load balancing. Understand the
architecture allows you to maintain the correct spanning tree and operate
effectively.
One VLAN can be mapped to a Multiple Spanning Tree Instance (MSTI). For
example, the maximum Instance we support is usually 16, range from 0-15. The
MSTP builds a separate Multiple Spanning Tree (MST) for each instance to
maintain connectivity among each of the assigned VLAN groups. An Internal
Spanning Tree (IST) is used to connect all the MSTP switches within an MST region.
An MST Region may contain multiple MSTP Instances.
The figure shows there are 2 VLANs/MSTP Instances and each instance has its Root
and forwarding paths.