1-13
Figure 1-5
Port roles
Connecting to the
common root bridge
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
In
Figure 1-5
, 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, port 3 and port 4 of
Device D are connected downstream to the other MST regions.
Port states
In MSTP, port states fall into the following three:
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 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 1-6
lists the port state(s) supported by
each port role. (“
√
” indicates that the port state is available for the corresponding port role; “—” indicates
that the port state is not available for the corresponding port role.)
Summary of Contents for 2928 - Baseline Plus Switch PWR
Page 92: ...1 9 Figure 1 7 Display the rate settings of ports ...
Page 105: ...1 4 Figure 1 3 Switch to the management level ...
Page 109: ...i Table of Contents 1 VCT 1 1 Overview 1 1 Testing Cable Status 1 1 ...
Page 114: ...1 2 Figure 1 2 Port traffic statistics ...
Page 279: ...1 28 Figure 1 26 The Port Setup tab ...
Page 331: ...i Table of Contents 1 Service Management 1 1 Overview 1 1 Configuring Service Management 1 2 ...
