H3C S7500 Series Operation Manual page 249

Operation Manual – MSTP
H3C S7500 Series Ethernet Switches
MST region
Designated
Figure 1-2 Port role
X. Port states
Ports can be in the following three states:
Forwarding state: Ports in this state can forward user packets and receive/send
BPDU packets.
Learning state: Ports in this state can receive/send BPDU packets.
Discarding state: Ports in this state can only receive BPDU packets.
Table 1-1
Table 1-1 Combinations of port states and port roles
Port state
Forwarding
Learning
Discarding
Connecting to the
common root bridge
Edge ports
Port 1
Master port
B
port
Port 3
s
lists possible combinations of port states and port roles.
Root/
Port role
port/Mast
er port
√
√
√
Port 2
A
Alternate port
C
Port 5
D
Port 4
Designat Region
ed port edge port
√ √
√ √
√ √
1-5
Chapter 1 MSTP Configuration
Port 6
Backup port
Alternate Backup
port port
— —
— —
√ √