HP A6600 Configuration Manual page 49

Designated bridge and designated port
Table 7 Description of designated bridges and designated ports
Classification
For a device
For a LAN
As shown in
If Device A forwards BPDUs to Device B through port A1, the designated bridge for Device B is
•
Device A, and the designated port of Device B is port A1 on Device A.
Both Device B and Device C directly connect to the LAN. If Device B forwards BPDUs to the LAN, the
•
designated bridge for the LAN is Device B, and the designated port for the LAN is port B2 on Device
B.
Figure 13 A schematic diagram of designated bridges and designated ports
Path cost
Path cost is a reference value used for link selection in STP. By calculating path costs, STP selects relatively
robust links and blocks redundant links, and finally prunes the network into a loop-free tree.
Designated bridge
A device directly connected with the local
device and responsible for forwarding
BPDUs to the local device
The device responsible for forwarding
BPDUs to this LAN segment
Figure 13:
Designated port
The port through which the
designated bridge forwards BPDUs
to this device
The port through which the
designated bridge forwards BPDUs
to this LAN segment
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