Networking

Multi-Chassis Link Aggregation (MLAG) Explained

Network Design diagram · made in Skemio

MLAG network diagram showing dual aggregation switches linked by an inter-chassis link, providing bonded active-active connections to servers.
MLAG network diagram showing dual aggregation switches linked by an inter-chassis link, providing bonded active-active connections to servers.
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What it shows

  • Dual-homed servers get active-active bandwidth across two distinct switches.
  • Eliminates STP port blocking without single switch failure vulnerability.
  • Requires dedicated peer link (ICL) for control plane synchronization.

The takeaway

MLAG doubles server uplink capacity while keeping Layer 2 high availability.

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