SonicOS 7 System

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Link Aggregation Failover

SonicWall provides multiple methods for protecting against loss of connectivity in the case of a link failure, including High Availability (HA), Load Balancing Groups (LB Groups), and now Link Aggregation. If all three of these features are configured on an appliance, the following order of precedence is followed in the case of a link failure:

  1. High Availability
  2. Link Aggregation
  3. Load Balancing Groups

HA takes precedence over Link Aggregation. Because each link in the LAG carries an equal share of the load, the loss of a link on the Active firewall forces a failover to the Idle firewall (if all of its links remain connected). Physical monitoring needs to be configured only on the primary aggregate port.

When Link Aggregation is used with a LB Group, Link Aggregation takes precedence. LB takes over only when all the ports in the aggregate link are down.