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8 Configuring Multi-chassis
The Multi-chassis Link Aggregation feature (MC-LAG) provides resiliency at the edge of the network by
enabling dual homing of any standards-based edge switches to a pair of aggregation switches to provide a
Layer 2 multi-path infrastructure. MC-LAG enables a device to form a logical link aggregation (LAG)
interface with two or more other devices, providing additional benefits over traditional LAG in terms of
node level redundancy, multi-homing support, and loop-free Layer 2 network.
MC-LAG allows links that are physically connected to two different OmniSwitch 10K to appear as a
single link aggregation group to a third edge device. MC-LAG provides this functionality without running
layer 2 loop-detection protocols such as Spanning Tree Protocol between the edge and aggregation
switches, while still detecting data loop conditions, failure detection and convergence.
The following are some key points regarding MC-LAG configuration:
•
MC-LAG provides active/active dual homed connectivity to standards based L2 edge devices. There is
no support for standby ports.
•
Internal automatic configuration will disable spanning tree functionality on MC-LAG aggregate ports.
•
MC-LAG peers are seen as one aggregated group to dual homed edge device(s).
•
MAC addresses learned on an MC-LAG aggregate in one of the multi-chassis peers are also learned on
the other switch on the same MC-LAG aggregate.
•
A loop or duplicate packet prevention mechanism is implemented so that non-unicast frames received
on the Virtual Fabric Link are not flooded out any local MC-LAG ports
For more information on components of MC-LAG, see
page 8-9
OmniSwitch AOS Release 7 Network Configuration Guide
Link Aggregation
"MC-LAG Concepts and Components" on
March 2011
page 8-1
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