Chapter 14 Monitor: Spanning Tree
GS1900 Series User’s Guide
95
14.2.2 C IST Po rt
Use this screen to view the Switch’s spanning tree CIST port status. Click Mo nitor > Spa nning Tre e > CIST
Port to access this screen.
Fig ure 97 Monitor > Spanning Tree > CIST Port
Each field is described in the following table.
Bridge
Identifier
This is the unique identifier for this bridge, consisting of the bridge priority plus the MAC address.
Designated
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.
Remaining
Hops
This field displays the number of remaining hops.
Last Topology
Change
Topology change information is directly propagated throughout the network from the device that
generates the topology change.
Table 44 Monitor > Spanning Tree > CIST
LABEL DESCRIPTIO N
Table 45 Monitor > Spanning Tree > CIST Port
LABEL DESCRIPTIO N
Port This field displays the port number.
Identifier (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.
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