Operation Manual – MSTP
H3C S5500-EI Series Ethernet Switches
Chapter 1 MSTP Configuration
1-16
Connecting to the
common root bridge
Edge ports
Port 1
Port 2
Master port
Alternate port
Designated port
Port 3
Port 4
Port 5
A
B
C
D
Port 6
Backup port
MST region
Figure 1-5
Port roles
Figure 1-5
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.
