PLANET GSW-1602SF - Manual (Page 85)

User’s Manual of GSW-1602SF / GSW-2404SF
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.
Bridge ID = 15
Port 3
Port 1 Port 2
A
Bridge ID = 20
Port 1
Port 2 Port 3
C
Bridge ID = 30
Port 1
Port 2 Port 3
B
LAN 1
LAN 2 LAN 3
Portcast = 19
Portcast = 19 Portcast = 19
Portcast = 4
Portcast = 4
Portcast = 19
Portcast = 4
Portcast = 4
STP Figure Before Applying the STA Rules
In this example, only the default STP values are used.
Root Bridge
Port 3
Port 1 Port 2
A
Designated Bridge
Port 1
Port 2 Port 3
C
Port 1
Port 2 Port 3
B
LAN 1
LAN 2 LAN 3
Designated Port
Root Port Root Port
Designated Port
Blocked
STP Figure After Applying the STA Rules
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