Yaskawa V1000-Series Option SI-EM3D/V Dual Port EtherNet Modbus TCP/IP Technical Manual User Manual
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Max Age (secs)
The Max Age is displayed in seconds. This value is set by the root bridge and indicates how long a message can be passed
along before being discarded.
n
Port Information
Port Role
The Port Role identifies how the port is being used. The seven possible values for Port Role are described in
.
Table 38 Port Role Values
Port Role
Description
Unknown
An unknown error has occurred within RSTP.
Root
This port leads to the root bridge.
Designated
This port leads away from the root bridge.
Alternate
This port is an alternate path to the root bridge.
Backup
This port is an alternate path away from the root bridge.
Disabled
This port does not have an active link.
N/A
RSTP is disabled.
Port State
The Port State indicates if the port is accepting and sending messages. The four possible values for Port State and the features
Table 39 Port State Values
Port State
Accept Packets
Forward Packets
Learn MAC Addresses
Discarding
NO
NO
NO
Learning
NO
NO
YES
Forwarding
YES
YES
YES
N/A
RSTP is disabled.
Port Version
RSTP can operate in normal RSTP mode or support STP mode. When an STP-only node is detected on the network, this port
operates in STP mode and displays “STP”. “RSTP” will be displayed in all other cases.
Port BPDU Rx Count
The Port BPDU Rx Count shows the number of BPDU packets received on that port. In general, root ports receive far more
BPDU packets than designated ports.
9 Rapid Spanning Tree Protocol
YASKAWA SIEP YAICOM 17A V1000 Option Dual-Port Modbus TCP/IP SI-EM3D/V Technical Manual
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