Huawei Quidway S3500 Series Operation Manual page 437

Operation Manual - STP
Quidway S3500 Series Ethernet Switches
Switch B
Figure 1-3 Designated switch and designated port
For a switch, the designated switch is a switch in charge of forwarding packets to the
local switch via a port called the designated port accordingly. For a LAN, the designated
switch is a switch that in charge of forwarding packets to the network segment via a port
called the designated port accordingly. As illustrated in the Figure 1-3, Switch A
forwards data to Switch B via the port AP1. So to Switch B, the designated switch is
Switch A and the designated port is AP1. Also in the figure above, Switch B and Switch
C are connected to the LAN and Switch B forwards packets to LAN. So the designated
switch of LAN is Switch B and the designated port is BP2.
Note:
AP1, AP2, BP1, BP2, CP1 and CP2 respectively delegate the ports of Switch A, Switch
B and Switch C.
The specific calculation process of STP algorithm.
The following example illustrates the calculation process of STP.
The Figure 1-4 below illustrates the network.
Switch B
with priority 1
Figure 1-4 Ethernet switch networking
Switch A
AP1 AP2
BP1
Switch C
BP2
LAN
Switch A
with priority 0
AP1
5
10
BP1
BP2
4
Switch C
with priority 2
Huawei Technologies Proprietary
Chapter 1 MSTP Region-configuration
CP1
CP2
AP2
CP1
CP2
1-5