Westermo RedFox Series - Manual (Page 352)

Westermo OS Management Guide
Version 4.17.0-0
By default, the path cost of a port is assigned dynamically with values related
to the port speed (in-line with the recommendations of IEEE std 802.1D-2004).
The same path costs are used irrespective if the port is operating in RSTP or STP
mode.
Port Speed (Mbit/s) RSTP path cost
10 2000000
100 200000
1000 20000
It is also possible to configure the path cost manually. That may be useful to get
more fine grain control of which port in the LAN should be put in blocking state.
Setting path costs manually may be desirable when operating a LAN including a
mix of RSTP and STP capable, since STP uses a different set of default path costs.
16.1.4 RSTP and STP coexistence
WeOS supports both RSTP and STP, but WeOS always attempts to run RSTP on
every spanning-tree enabled port. WeOS automatically shifts to STP mode on
a port, if it detects a bridge running STP on that port. Other ports continue
operating in RSTP mode. When operating a network including a mix of RSTP and
STP bridges, it may be necessary to configure path costs manually to get the
intended spanning tree behaviour, see also
section 16.1.3 .
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