Chapter 27 Configuration: Spanning Tree
GS1900 Series User’s Guide
172
27.2.4 The C IST Sc re e n
Use this screen to view the
C IST
settings. Click
C o nfig ura tio n
>
Spa nning Tre e
>
C IST
to open this screen.
Fig ure 172
Configuration > Spanning Tree > CIST
The following table describes the labels in this screen.
P2P MAC
Select
Ye s
to activate P2P MAC or
No
to deactivate it.
Migrate
Select
Ye s
to activate Migrate or
No
to deactivate it.
Apply
Click
Apply
to save the changes.
Cancel
Click
C a nc e l
to discard the changes.
Table 118 Configuration > Spanning Tree > STP Port > Edit (continued)
LABEL
DESC RIPTIO N
Table 119 Configuration > Spanning Tree > CIST
LABEL
DESC RIPTIO N
CIST Instance
Priority
Configure priority of CIST bridge ID.
Priority is part of bridge ID, used for CIST root bridge selection.
Max Hops
Enter a maximum number of hops value. The value can be between 1 and 40.
Forward Delay
This is the maximum time (in seconds) a switch will wait before changing states. This delay is
required because every switch must receive information about topology changes before it
starts to forward frames. In addition, each port needs time to listen for conflicting information
that would make it return to a blocking state; otherwise, temporary data loops might result. The
allowed range is 4 to 30 seconds.
As a general rule:
2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Max Age
This is the maximum time (in seconds) a switch can wait without receiving a BPDU before
attempting to reconfigure. All switch ports (except for designated ports) should receive BPDUs
at regular intervals. Any port that ages out STP information (provided in the last BPDU) becomes
the designated port for the attached LAN. If it is a root port, a new root port is selected from
among the switch ports attached to the network. The allowed range is 6 to 40 seconds.
Tx Hold Count
Enter a transmission hold count value. The value can be between 1 and 10.
Hello Time
This is the time interval in seconds between BPDU (Bridge Protocol Data Units) configuration
message generations by the root switch. The allowed range is 1 to 10 seconds.
Apply
Click
Apply
to save the changes.
Cancel
Click
C a nc e l
to discard the changes.
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