Yaskawa V1000-Series Option SI-EM3D/V Dual Port EtherNet Modbus TCP/IP Technical Manual - Manual (Page 44)

u RSTP Monitor U6-96
Monitor U6-96 is dedicated to RSTP. U6-96 shows the role and state for each port.
The displayed value has four digits. The first two digits belong to port 1 and the last two digits belong to port 2. The first and
third digits represent port role while the second and fourth digits represent port state.
The possible port role and state values are shown in
Figure 32 .
3 2 2 2
Port 1 Role Port 1 State Port 2 Role Port 2 State
0 Unknown
2 Root
3 Designated
4 Alternate
5 Backup
6 Disabled
9 RSTP Disabled
0 Discarding
1 Learning
2 Forwarding 0 Unknown
2 Root
3 Designated
4 Alternate
5 Backup
6 Disabled
9 RSTP Disabled
0 Discarding
1 Learning
2 Forwarding
Figure 32 U6-96 Monitor Values
Refer to Table 38 for descriptions of the port role values.
Refer to Table 39 for descriptions of the port state values.
Below are a few examples:
• 9292 = RSTP is disabled and both ports are forwarding.
• 3222 = Port 1 is forwarding and is the designated port. Port 2 is forwarding and is the root port.
• 2232 = Port 1 is forwarding and is the root port. Port 2 is forwarding and is the designated port.
• 3232 = Both ports are forwarding and are designated ports. This only occurs when the option is the root bridge.
• 4022 = Port 1 is discarding and is the alternate port. Port 2 is forwarding and is the root port.
• 2260 = Port 1 is forwarding and is the root port. Port 2 is discarding and is the disabled port.
9 Rapid Spanning Tree Protocol
44 YASKAWA SIEP YAICOM 17A V1000 Option Dual-Port Modbus TCP/IP SI-EM3D/V Technical Manual