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 > CIST 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 A pp ly 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 DESCRIPTIO N
Table 119 Configuration > Spanning Tree > CIST
LABEL DESCRIPTIO 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 A pp ly to save the changes.
Cancel Click C a nc e l to discard the changes.
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