Rockwell Automation 1783-EMS08T Stratix 6000 Ethernet Managed Switch User Manual - Manual (Page 55)

Rockwell Automation Publication 1783-UM001D-EN-P - January 2013 55
Switch Management Chapter 4
STP/RSTP Configuration
To configure the switch for STP or RSTP, use the following procedure.
1. From the navigation pane, expand the Switch Configuration folder and
select RSTP Configuration to display the RSTP Configuration tab.
2. Configure bridge parameters as described in the table below.
Bridge Parameter Description
RSTP Mode Choose one of the following network modes:
• Disabled—The switch does not run RSTP or STP. This is the default mode.
• Enabled (RSTP)—The switch runs RSTP.
• Enabled (STP Compatibility)—Enables the switch to be manually configured to run
STP.
Bridge Priority (hex) Type a hex value from 0000…F000 to determine which switch on the network is
assigned the role of root bridge.
The default value is 8000.
The spanning tree algorithm uses the following rules to determine the root bridge:
• The switch with the lowest priority becomes the root bridge.
• If two switches have the same priority, then the switch with the lowest MAC address
becomes the root bridge.
Max Age (sec) Type a value in seconds from 6…40 to specify the maximum time that a BPDU is saved
before expiring.
The default value is 40.
Forward Delay (sec) Type a value in seconds from 4…30 to specify the time spent in the Listening and
Learning states.
The default value is 15.
Transmit Hold Count (-) Type a value from 1…10 to configure the number of BPDUs that can be transmitted
within the Hello Time interval.
The default value is 6.
Hello Time (sec) Displays the hello time interval in seconds. A switch running RSTP generates
configuration messages once every hello time interval.If the switch does not receive a
configuration message after an interval of three hello times, it determines that
communication is lost.