User’s Manual of IGS-4215-16T2S
4.6.4 CIST Instance Setting
This page allows you to configure CIST instance settings. The CIST Instance Setting and Information screens in Figure 4-6-8 &
Figure 4-6-9 appear.
Figure 4-6-8: CIST Instance Setting Page Screenshot
The page includes the following fields:
Object Description
• priority
Controls the bridge priority. Lower numeric values have better priority. The bridge
priority plus the MSTI instance number, concatenated with the 6-byte MAC
address of the switch forms a Bridge Identifier.
For MSTP operation, this is the priority of the CIST. Otherwise, this is the priority
of the STP/RSTP bridge.
• Max Hops
This defines the initial value of remaining Hops for MSTI information generated at
the boundary of an MSTI region. It defines how many bridges a root bridge can
distribute its BPDU information. Valid values are in the range 6 to 40 hops.
• Forward Delay
The delay used by STP Bridges to transition Root and Designated Ports to
Forwarding (used in STP compatible mode). Valid values are in the range 4 to 30
seconds
-Default: 15.
-Minimum: The higher of 4 or [(Max. Message Age / 2) + 1].
-Maximum: 30.
• Max Age
The maximum age of the information transmitted by the Bridge when it is the
Root Bridge. Valid values are in the range 6 to 40 seconds.
-Default: 20.
-Minimum: The higher of 6 or [2 x (Hello Time + 1)].
-Maximum: The lower of 40 or [2 x (Forward Delay -1)].
• Tx Hold Count
The number of BPDU's a bridge port can send per second.
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