Cist Port - ZyXEL Communications GS1900 Series User Manual

Table 44 Monitor > Spanning Tree > CIST
L ABEL
Bridge
Identifier
Designated
Root Bridge
External Root
Path Cost
Regional Root
Bridge
Internal Root
Path Cost
Designated
Bridge
Root Port
Remaining
Hops
Last Topology
Change
14.2.2 C IST Po rt
Use this screen to view the Switch's spanning tree CIST port status. Click
to access this screen.
Po rt
Monitor > Spanning Tree > CIST Port
Fig ure 97
Each field is described in the following table.
Table 45 Monitor > Spanning Tree > CIST Port
L ABEL
Port
Identifier (Priority /
Port Id)
External Path Cost
Operation
Chapter 14 Monitor: Spanning Tree
DESC RIPT IO N
This is the unique identifier for this bridge, consisting of the bridge priority plus the MAC address.
Root bridge refers to the base of the spanning tree.
The cost of the path from this bridge to the CIST Root Bridge.
Root bridge refers to the base of the spanning tree.
The cost of the path from this bridge to the internal Regional Root 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.
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.
This field displays the number of remaining hops.
Topology change information is directly propagated throughout the network from the device that
generates the topology change.
DESC RIPT IO N
This field displays the port number.
This field displays the identifier (in priority / port number).
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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