Chapter 6. Redundant Media
GFK-2571N May 2018 133
6.1.7 MRP Ring Ethernet Traffic Storm Prevention
The LAN2 Ethernet ports used for the embedded IO-Controller function in 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 a MRM configuration has
been stored to any Ethernet node on the ring, including to LAN2 on 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 ring’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 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 a MRM.
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