Chapter 13 Monitor: Spanning Tree
GS1900 Series User’s Guide
77
Each field is described in the following table.
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
Table 42 Monitor > Spanning Tree > CIST Port
LABEL DESCRIPTION
Port This field displays the port number.
Indentifier
(Priority / Port Id)
This field displays the identifier (in priority / port number).
External Path Cost
Operation
Path cost is the cost of transmitting a frame on to a LAN through that port. It is
recommended to assign this value according to the speed of the bridge. The slower the
media, the higher the cost.
Internal Path Cost
Operation
Path cost is the cost of transmitting a frame on to a LAN through that port. It is
recommended to assign this value according to the speed of the bridge. The slower the
media, the higher the cost.
Designate Root
Bridge
Root bridge refers to the base of the spanning tree.
External Root Cost This field displays the external root cost.
Regional Root
Bridge
Root bridge refers to the base of the spanning tree.
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
Operation
An edge port changes its initial STP port state from blocking state to forwarding state
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
Operation
This field displays the state of the P2P MAC operation.
Port Role This field displays the state of the port role.
Port State This field displays the state of the port.
