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CHAPTER 6: SPANNING TREE
FIGURE 6-2. STP BRIDGE CONFIGURATION SCREEN
PARAMETER DESCRIPTION
Basic Settings
Protocol Version: The MSTP/RSTP/STP protocol version setting. Valid values are STP, RSTP and MSTP.
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.
Hello Time: The interval between sending STP BPDU’s. Valid values are in the range 1 to 10 seconds, default is 2 seconds.
NOTE: We do NOT recommend changing this parameter from the default value, and this may have adverse effects on your network.
Forward Delay: The delay used by STP Bridges to transmit Root and Designated Ports to Forwarding (used in STP compatible mode).
Valid values are in the range 4 to 30 seconds.
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, and MaxAge must be <= (FwdDelay-1)*2.
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 to. Valid values are in the range 6 to 40 hops.
Transmit Hold Count: The number of BPDU’s a bridge port can send per second. When exceeded, transmission of the next BPDU will
be delayed. Valid values are in the range 1 to 10 BPDU’s per second.
Advanced Settings
Edge Port BPDU Filtering: Control whether a port explicitly configured as Edge will transmit and receive BPDUs.
Edge Port BPDU Guard: Control whether a port explicitly configured as Edge will disable itself upon reception of a BPDU. The port will
enter the error-disabled state, and will be removed from the active topology.
Port Error Recovery: Control whether a port in the error-disabled state automatically will be enabled after a certain time. If recovery is
not enabled, ports have to be disabled and re-enabled for normal STP operation. The condition is also cleared by a system reboot.
