Siemens SCALANCE X-300 Configuration Manual page 76

Configuration using Web Based Management and Command Line Interface
4.3 The X-300/X-400 menu
two devices in the ring. You can select any name to suit your purposes, however, you can
only use the name for one pair of devices in the entire network.
Force Device to Standby Master
If you select this check box, the device is configured as a standby master regardless of its
MAC address. If this check box is not selected for either of the devices for which the standby
function is enabled, then assuming that no error has occurred, the device with the higher
MAC address adopts the role of standby master. If the option is selected for both devices or
if the "Force Device to Standby Master" property is supported by only one device, the
standby master is also selected based on the MAC address. This type of assignment is
important in particular when a device is replaced. Depending on the MAC addresses, the
previous device with the slave function can take over the role of the standby master.
Wait for Standby Partner (SCALANCE X-300 only)
● Enabled
A standby connection is enabled only when the standby master and standby slave and
their standby partners have established a connection.
This ensures that the redundant connection is really available before communication is
started via a standby connection.
● Disabled
A standby connection is enabled even if the standby master has not yet established a
connection to the standby slave.
Standby Observer enabled
Enable or disable the function by selecting the check box.
You will find more information on this function in the section X-300/X-400 observer
(Page 73).
Enable Standby Port Monitoring
Note
If the standby observer function is enabled, you can only select one single standby port.
Here, you specify which ports are standby ports. Standby ports are involved in the
redirection of data traffic. In there are no problems, only the standby ports of the master are
enabled and handle to the data traffic into the connected HRP rings or HRP buses. If the
master or the Ethernet connection (link) of one of the standby ports of the master fails, all
standby ports of the master will be disabled and the standby ports of the slave enabled. As a
result, a functioning Ethernet connection to the connected network segments (HRP rings or
HRP buses) is restored.
Note
If there are links to several rings (more than one port is enabled in "Standby Port
Monitoring"), the standby master and standby slave may only have one Ethernet connection
each to one ring. Otherwise circulating frames will result and lead to a loss of data traffic.
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Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400