H3c-technologies H3C WX5500E Series Access Controllers Uživatelský manuál stáhnout pdf (Strana 184)

174

Figure 167 Port roles

In Figure 167, devices A, B, C, and D constitute an MST region. Port 1 and port 2 of device A are

connected to the common root bridge, port 5 and port 6 of device C form a loop, and port 3 and port

4 of Device D are connected downstream to the other MST regions.

Port states

In MSTP, a port can be in one of the following states:

• Forwarding—The port learns MAC addresses and forwards user traffic.

• Learning—The port learns MAC addresses but does not forward user traffic.

• Discarding—The port does not learn MAC addresses or forwards user traffic.

A port can have different port states in different MSTIs. A port state is not exclusively associated with a

port role. Table 60 lists the

port states supported by each port role. ("√" indicates that the port state is

available for the corresponding port role, and "—" indicates that the port state is not available for the

corresponding port role.)

Table 60 Ports states supported by different port roles

Port state

Port role

Root port/master

ort

Designated

ort

Boundary

ort

Alternate port Backup port

Forwarding √ √ √ — —

Learning √ √ √ — —

Discarding √ √ √ √ √

1 2 ... 179 180 181 182 183 184 185 186 187 188 189 ... 253 254

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H3c-technologies H3C WX5500E Series Access Controllers Uživatelský manuál Strana 184