Cist Port - ZyXEL Communications GS1900 Series User Manual

Chapter 13 Monitor: Spanning Tree
Each field is described in the following table.
Table 41 Monitor > Spanning Tree > CIST
LABEL
State
Bridge
Indentifier
Designate
Root Bridge
External Root
Path Cost
Regional Root
Bridge
Internal Root
Path Cost
Designated
Bridge
Root Port
Remanining
Hops
Last Topology
Change

13.2.2 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 59 Monitor > Spanning Tree > CIST Port
76
DESCRIPTION
This field displays the state.
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 remanining hops.
Topology change information is directly propagated throughout the network from the device
that generates the topology change.
GS1900 Series User's Guide