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there. Setting-up STP using values other than the defaults, can be complex. Therefore, you are advised to keep the
default factory settings and STP will automatically assign root bridges/ports and block loop connections. Influencing STP
to choose a particular switch as the root bridge using the Priority setting, or influencing STP to choose a particular port to
block using the Port Priority and Port Cost settings is, however, relatively straight forward.
B
Port 2
In this example, only the default STP values are used.
B
Port 2
A
Port 1
Portcast = 4
Portcast = 4
Port 1
Bridge ID = 30
Port 3
Portcast = 19
LAN 2
Figure 5-40 Before Applying the STA Rules
A
Port 1
Designated Port
Root Port
Port 1
Port 3
LAN 2
Figure 5-41 After Applying the STA Rules
LAN 1
Portcast = 19
Port 3
Bridge ID = 15
Port 2
Portcast = 4
Portcast = 4
Portcast = 19
Port 2
LAN 1
Port 3
Root Bridge
Port 2
Designated Port
Root Port
Blocked
Port 2
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User's Manual of ISW-1022M
C
Port 1
Bridge ID = 20
Port 3
Portcast = 19
LAN 3
C
Port 1
Designated Bridge
Port 3
LAN 3
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