H3c-technologies H3C WX6000 Series Access Controllers Uživatelský manuál stáhnout pdf (Strana 171)

100

101

20-13

Figure 20-5 Port roles

Connecting to the

common root bridge

Edge ports

Port 1

Port 2

Master port Alternate port

Designated port

Port 3 Port 4

Port 5

Port 6

Backup port

MST region

Figure 20-4 helps understand these concepts. Where,

z Devices A, B, C, and D constitute an MST region.

z Port 1 and port 2 of device A connect to the common root bridge.

z Port 5 and port 6 of device C form a loop.

z Port 3 and port 4 of device D connect downstream to other MST regions.

11) Port states

In MSTP, port states fall into the following tree:

z Forwarding: the port learns MAC addresses and forwards user traffic;

z Learning: the port learns MAC addresses but does not forward user traffic;

z Discarding: the port neither learns MAC addresses nor forwards user traffic.

When in different MST instances, a port can be in different states.

z The role a boundary port plays in an MSTI is consistent with the role it plays in the CIST. The

master port, which is a root port in the CIST while a master port in the other MSTIs, is an exception.

z For example, in Figure 20-5, port 1 on switch A is a boundary port. It is a root port in the CIST while

a master port in all the other MSTIs in the region.

A port state is not exclusively associated with a port role.

Table 20-6 lists the port state(s) supported by

each port role (“√” indicates that the port supports this state, while “—“ indicates that the port does not

support this state).

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 677 678

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