9 Rapid Spanning Tree Protocol (RSTP)
YASKAWA
SIEP C730600 0E YAI Modbus TCP/IP Technical Manual
49
■
Webpage Settings
The values displayed in the various pages are refreshed at the rate defined in the [Data Update Time (ms)] select
box.
The [Data Update Time] can be set to 250 ms, 500 ms, 1 second, 2 seconds, or 5 seconds.
■
Email Settings
The [Email Server Address] text box must contain the IP address of the email server. The subnet address is
configured in drive parameters
F7-05
through
F7-08
. The configured email alerts will use the server at this
address when sending emails.
Enter the email server port in the [Email Server Port] text box.
The value in the [From Email Address] text box identifies the origin of the email alerts to the recipient.
To save the entered information into the option, click [Save Email Settings].
9
Rapid Spanning Tree Protocol (RSTP)
Rapid Spanning Tree Protocol (RSTP) is a mechanism that allows an Ethernet network to be configured as a ring
or other topology that may have more than one pathway to each node. The RSTP protocol automatically
determines the most efficient pathway to each node and disables any redundant pathways.
If one path fails, RSTP activates another pathway to keep the network traffic flowing. After restoring the failed
path, RSTP disables any redundant paths without disrupting network traffic.
◆
Convergence Time
Convergence is the process that RSTP performs to identify the root node and which pathways to disable.
Convergence occurs on power up and when the network changes (e.g., path failures and restorations).
Take special care when using parameter
F7-16 [Timeout Value]
, Communication Timeout Loss, and be sure to
give RSTP enough time for convergence. When
F7-16
is set too short, convergence will not be able to complete
before it expires. The complexity of the network and the number of drives on the network will both factor into the
value of the timeout.
RSTP is unnecessary and should be disabled when using star or line topology network configurations (RSTP is
disabled by default).
◆
Topology
The option is ideal for use in ring topologies. With RSTP enabled, a ring topology provides redundancy to the
network. RSTP determines the fastest paths to each node on the network and virtually splits the ring by disabling
one port on one node to prevent data from being transmitted endlessly around the ring. If a path on the ring fails,
RSTP re-enables the disabled port and reconnects the split. All nodes on the network remain accessible without
any interruptions.
RSTP is unnecessary and should be disabled when using star or line topology network configurations (RSTP is
disabled by default).
◆
Enabling RSTP
RSTP is enabled from the webpage on the option.
1.
Use the keypad to read the IP address values from monitors
U6-80
,
U6-81
,
U6-82
, and
U6-83
.
The IP address of the option is necessary to access the webpage.
The IP address of the option is necessary to access the webpage. Use the operator to read the IP address
values from monitors
U6-80
,
U6-81
,
U6-82
, and
U6-83
.
Refer to
for example values of the monitors for an option IP address of 192.168.1.20.
Table 9.1 Example IP Address Monitor Values
Monitor
Value
U6-80
192
U6-81
168
