Chapter 5
Setup and Configuration
RUGGEDCOM ROS
User Guide
152 Configuring STP for Specific Ethernet Ports
Parameter Description
The time for which a configuration message remains valid after being issued by the root
bridge. Configure this parameter with care when many tiers of bridges exist, or slow
speed links (such as those used in WANs) are part of the network
Transmit Count Synopsis: 3 to 100 or { Unlimited }
Default: Unlimited
Maximum number of BPDUs on each port that may be sent in one second. Larger
values allow the network to recover from failed links/bridges more quickly.
Forward Delay Synopsis: 4 to 30 s
Default: 15 s
The amount of time a bridge spends learning MAC addresses on a rising port before
beginning to forward traffic. Lower values allow the port to reach the forwarding state
more quickly, but at the expense of flooding unlearned addresses to all ports.
Max Hops Synopsis: 6 to 40
Default: 20
Only applicable to MSTP. The maximum possible bridge diameter inside an MST region.
MSTP BPDUs propagating inside an MST region specify a time-to-live that is
decremented by every switch that propagates the BPDU. If the maximum number of
hops inside the region exceeds the configured maximum, BPDUs may be discarded due
to their time-to-live setting.
3. Click Apply.
Section 5.3.5
Configuring STP for Specific Ethernet Ports
To configure the Spanning Tree Protocol (STP) for a specific Ethernet port, do the following:
1. Navigate to Spanning Tree » Configure Port RSTP Parameters. The Port RSTP Parameters table
appears.
Figure 96: Port RSTP Parameters Table
2. Select an Ethernet port. The Port RSTP Parameters form appears.
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