ZyXEL Communications GS1900 Port, Bridge, Bridge, P2P MAC, Operation, Operation, Edge Port, Operation, Operation, Port Role, Port State, Indentifier, Regional Root, Designate Root

Chapter 13 Monitor: Spanning Tree

Each field is described in the following table.

Table 42 Monitor > Spanning Tree > CIST Port

LABEL	DESCRIPTION
Port	This field displays the port number.
Indentifier	This field displays the identifier (in priority / port number).
(Priority / Port Id)
External Path Cost	Path cost is the cost of transmitting a frame on to a LAN through that port. It is
Operation	recommended to assign this value according to the speed of the bridge. The slower the
	media, the higher the cost.
Internal Path Cost	Path cost is the cost of transmitting a frame on to a LAN through that port. It is
Operation	recommended to assign this value according to the speed of the bridge. The slower the
	media, the higher the cost.
Designate Root	Root bridge refers to the base of the spanning tree.
Bridge
External Root Cost	This field displays the external root cost.
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.
Edge Port	An edge port changes its initial STP port state from blocking state to forwarding state
Operation	immediately without going through listening and learning states right after the port is
	configured as an edge port or when its link status changes.
P2P MAC	This field displays the state of the P2P MAC operation.
Operation
Port Role	This field displays the state of the port role.
Port State	This field displays the state of the port.

13.2.3 MST

Use this screen to view the Switch’s spanning tree MST instance. Click Monitor > Spanning Tree

>MST to access this screen.Figure 60 Monitor > Spanning Tree > MST

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GS1900 Series User’s Guide