ZyXEL Communications GS1900 Port, State, MST ID, Bridge, Change, MST ID, MSTI ID, Root Port, Regional Root, Last Topology, Remanining Hops, Designated Bridge, Internal Root Cost

Chapter 13 Monitor: Spanning Tree

Each field is described in the following table.

Table 43 Monitor > Spanning Tree > MST

LABEL	DESCRIPTION
MST ID	This is the unique identifier for this MST.
	Select a number from the drop-down menu to display results.
State	This field displays the state.
Regional Root	Root bridge refers to the base of the spanning tree.
Bridge
Internal Root Cost	This field displays the internal root cost.
Designated Bridge	For each LAN segment, a designated bridge is selected. This bridge has the lowest cost
	to the root among the bridges connected to the LAN.
Root Port	On each bridge, the bridge communicates with the root through the root port. The root
	port is the port on this Switch with the lowest path cost to the root (the root path cost).
	If there is no root port, then this Switch has been accepted as the root bridge of the
	spanning tree network.
Remanining Hops	This field displays the number of remanining hops.
Last Topology	Topology change information is directly propagated throughout the network from the
Change	device that generates the topology change.

13.2.4 MST Port

Use this screen to view the Switch’s spanning tree MST port status. Click Monitor > Spanning Tree > MST Port to access this screen.

Figure 61 Monitor > Spanning Tree > MST Port

Each field is described in the following table.

Table 44 Monitor > Spanning Tree > MST Port

LABEL	DESCRIPTION
MST ID	This is the unique identifier for this MST.
	Select a number from the drop-down menu to display results.
Port	This field displays the port number.
MSTI ID	A VLAN can be mapped to a specific Multiple Spanning Tree Instance (MSTI). MSTI
	allows multiple VLANs to use the same spanning tree.

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	GS1900 Series User’s Guide