Planet GSW-1602SF User Manual page 85

Now, if switch A broadcasts a packet to switch C, then switch C will drop the packet at port 2 and the broadcast will end
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
STP Figure Before Applying the STA Rules
A
Port 1
Designated Port
Root Port
Port 1
Port 3
LAN 2
STP Figure After Applying the STA Rules
User's Manual of GSW-1602SF / GSW-2404SF
LAN 1
Portcast = 19
Port 3
Bridge ID = 15
Port 2
Portcast = 4
Portcast = 4
C
Portcast = 19
Port 2
LAN 1
Port 3
Root Bridge
Port 2
Designated Port
Root Port
C
Blocked
Port 2
-79-
Port 1
Bridge ID = 20
Port 3
Portcast = 19
LAN 3
Port 1
Designated Bridge
Port 3
LAN 3