Device Management
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LAN, it is the port that forwards BPDUs to the network segment.
5. Path cost
The parameter for choosing the link path by STP. By calculating the path cost, STP chooses
the better links and blocks the redundant links so as to disbranch the ring-network to form a
tree-topological ring-free network.
BPDU Priority in STP mode
BPDU with a smaller root bridge ID has a higher priority. If the root bridge ID are identical,
then compare the root path cost as follows: root path cost in BPDU plus the path cost
corresponding to that port, assume that the sum of the both is S, the BPDU with a smaller S
has a relatively high priority.
If the root path costs are also identical, then compare the IDs of designated bridge, IDs of
designated port ID, and the IDs of ports receiving the BPDU successively, and the BPDU
with smaller values mentioned above has a relatively high priority.
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