H3C S9500 Series Operation Manual page 691

Routing switches

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Operation Manual – STP

H3C S9500 Series Routing Switches

Figure 1-6 Designated bridge and designated port

For a switch, the designated bridge is a switch in charge of forwarding BPDU to the

local switch via a port called the designated port accordingly. For a LAN, the designated

bridge is a switch that is in charge of forwarding BPDU to the network segment via a

port called the designated port accordingly. As illustrated in the Figure 1-6, Switch A

forwards data to Switch B via the port AP1. To Switch B, the designated bridge is Switch

A and the designated port is AP1. In the figure, Switch B and Switch C are connected to

the LAN and Switch B forwards BPDU to LAN. So the designated bridge of LAN is

Switch B and the designated port is BP2.

The specific calculation process of STP algorithm.

The following example illustrates the calculation process of STP.

Figure 1-7 illustrates the practical network.

with priority 1

Figure 1-7 Ethernet switch networking

To facilitate the descriptions, only the first four parts of the configuration BPDU are

described in the example. They are root ID (expressed as Ethernet switch priority), path

cost to the root, designated bridge ID (expressed as Ethernet switch priority) and the

designated port ID (expressed as the port number). As illustrated Figure 1-7, the

with priority 0

with priority 2

Chapter 1 MSTP Region-configuration

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