RSTI-EP PROFINET I/O Controller User Manual
Section 6
GFK-2571R
May 2021
Redundant Media
137
6.1.7
MRP Ring Ethernet Traffic Storm Prevention
The LAN2 Ethernet ports used for the embedded IO-Controller function in CPL410, CPE400,
CPE330 and CPE100/CPE115 may be used as an MRP Ring Manager (MRM). Since LAN2
defaults to be an Ethernet switch, it is required that the physical ring must not be connected
until an MRM configuration has been stored to any Ethernet node on the ring, including to
LAN2 on CPL410, CPE400, CPE330 or CPE100/CPE115.
Failure to have an active MRM configured in an Ethernet ring will result in an Ethernet traffic
storm caused by the r
ing’s network loop topology. The Ethernet traffic storm will prevent
communication to all Ethernet nodes connected to the ring until the ring is broken or an
MRM is configured.
The CPL410, CPE400, CPE330 and CPE100/CPE115 maintains its MRM status after a
hardware configuration clear and until it is subjected to a power cycle. After clearing the
hardware configuration, and before power-cycling a CPU that was configured as an MRM in
a ring topology, it is recommended that either:
a.
The ring be physically broken by disconnecting an Ethernet port on any network node
in the ring, or
b.
Any other network node in the ring be configured as an MRM.
6.1.8
Third-party MRP Manager Use with PROFINET
Controller as MRP Client
When using a third-party MRP Manager, it is recommended to set the MRP Manager Test
Monitoring Interval to 10ms and Test Monitoring Count to 2 and/or connect the PROFINET
Controller client directly to a device that provides fast link down detection.
Failure to follow these recommendations may result in degraded MRP Ring update
performance for bumpless operation, due to the speed at which ring breaks are detected.
Use the tables below as a guide when choosing not to follow the recommendations.
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