OmniSwitch os6900, Руководство по настройке сети

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Configuring Multi-chassis Link Aggregation MCLAG Overview
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 10-11
Loop Detection is a utility provided to enable network loop detection. As a rule, take care not to create
back door loops through edge devices. The loop detection mechanism is enabled or disabled per system
and generates multicast Loop Detect PDU at regular interval.
Benefits of MCLAG
•
MCLAG ensures high-availability in the network by providing node resiliency on the aggregation
layer.
•
MCLAG provides dual-homed Layer 2 multi-path connections for edge nodes into the aggregation
without running the Spanning Tree protocol. The edge device can be any LACP capable-device.
•
MCLAG delivers active/active forwarding mode whereby both sets of uplinks that are part of the dual
homed aggregates are processing traffic to maximize the value of the customer investment.
Example of a MCLAG Group Network
An important characteristic of this solution relates to the absence of a logical loop between the edge and
multi-chassis peer switches, even though a physical loop does exist.
MCLAG Principle
In order to ensure a loop free topology, traffic received on one of the ports of an aggregate is never
flooded out to any of the member ports including the receiving port or through the VFL.
As shown in the following diagram, two switches are connected back to back through an LACP interface.
If flooded traffic (multicast, broadcast, unknown traffic) is received by switch SW
2
on Port A, it will not
be flooded out on either Port B or Port C. Additionally, it cannot be sent back out of the same port where it
was received.
Edge Aggregation
Virtual Fabric
Link
Physical loop
No logical loop to be
guaranteed by the
feature design.
Edge Aggregation
Virtual Fabric
Link
Physical loop
No logical loop to be
guaranteed by the
feature design.
Edge Aggregation
MC-LAG-1
Virtual Fabric
Link
Physical loop
No logical loop
guaranteed by the
feature design.