MCLAG Overview Configuring Multi-chassis Link Aggregation
page 10-12 OmniSwitch AOS Release 7 Network Configuration Guide June 2013
Basic MCLAG Principle
MCLAG Loop Detection
Since the Spanning Tree Protocol is disabled on MCLAG ports, the MCLAG feature provides a method of
loop detection in order to detect an invalid network topology. The mechanism provides loop detection for
any potential loops that include a set of MCLAG aggregate ports.
The loop detection mechanism generates multicast Loop Detect PDU at regular intervals. In a MCLAG
network, the source MAC is reserved and the MAC is unique to each chassis ID. The multicast PDU is
flooded out on the VFL and MCLAG primary ports.
Loop Detection is flagged when the PDU is returned to the transmitting peer, causing the following to
occur.
• A log message is sent for loop detect event.
• A SNMP trap is generated, and
• The offending port is shutdown.
Port A
Port B
Port C
Port X
The traffic received on Port A
cannot be flooded out Port B
or Port C.
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