User’s Manual of GS-5220 LCD Series
234
• Protocol Version
The STP protocol version setting. Valid values are:
STP (IEEE 802.1D Spanning Tree Protocol)
RSTP (IEEE 802.2w Rapid Spanning Tree Protocol)
MSTP (IEEE 802.1s Multiple Spanning Tree Protocol)
• Bridge 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.
• 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)]
• Maximum Hop Count
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.
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