User's Manual

17-8
17.3 MSTP Example
The following is a typical MSTP application example:
Figure 17-2 Typical MSTP Application Scenario
The connections among the switches are shown in the above figure. All the switches run in the MSTP mode
by default, their bridge priority, port priority and port route cost are all in the default values (equal). The default
configuration for switches is listed below:
Bridge Name
Switch1
Switch2
Switch3
Switch4
Bridge MAC
Address
…00-00-01 …00-00-02 …00-00-03 …00-00-04
Bridge Priority
32768
32768
32768
32768
Port Priority
Port 1
128
128
128
Port 2
128
128
128
Port 3
128
128
Port 4
128
128
Port 5
128
128
Port 6
128
128
Port 7
128
128
Route Cost
Port 1
200000
200000
200000
Port 2
200000
200000
200000
Port 3
200000
200000
Port 4
200000
200000
Port 5
200000
200000
Port 6
200000
200000
Port 7
200000
200000
By default, the MSTP establishes a tree topology (in blue lines) rooted with SwitchA. The ports marked with “x”
are in the discarding status, and the other ports are in the forwarding status.
Switch2
Switch3
Switch4
1
1
2
2
3
5
4
2
3
1
6
7
5
4
6
7
x
x
x
x
x
Switch1