C122-B001-02EN
5-33
5.3 Notes on System Design
STP setting for VLAN
When VLAN is divided to avoid a loop, set STP to off.
STP operates for each device. Even when VLAN is divided, STP determines a loop
and blocks one port.
Figure 5.13 STP setting for VLAN
A loop configuration is avoided by separating the A and B pair of ports from the C
and D pair of ports using divided VLANs. However, STP detects a loop and blocks
port C, and accordingly the communication between ports C and D is disabled.
GSWB
SW
VLAN2
VLAN3
Port A
Port B
Port C
Port D
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