Chapter 14 Monitor: Spanning Tree
GS1900 Series User’s Guide
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Each field is described in the following table.
14.2.2 CIST Port
Use this screen to view the Switch’s spanning tree CIST port status. Click Monitor > Spanning
Tree > CIST Port to access this screen.
Figure 76 Monitor > Spanning Tree > CIST Port
Table 42 Monitor > Spanning Tree > CIST
LABEL DESCRIPTION
State This field displays the state.
Bridge
Indentifier
This is the unique identifier for this bridge, consisting of the bridge priority plus the MAC
address.
Designate
Root Bridge
Root bridge refers to the base of the spanning tree.
External Root
Path Cost
The cost of the path from this bridge to the cist Root Bridge.
Regional Root
Bridge
Root bridge refers to the base of the spanning tree.
Internal Root
Path Cost
The cost of the path from this bridge to the internal Regional Root Bridge.
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
Change
Topology change information is directly propagated throughout the network from the device
that generates the topology change.
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