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SonicOS 5.8.1 Administrator Guide
2. Click on the Advanced tab.
3. In the Redundant/Aggregate Ports pulldown menu, select Link Aggregation.
4. The Aggregate Port option is displayed with a checkbox for each of the currently
unassigned interfaces on the firewall. Select up to three other interfaces to assign to the
LAG.
Note After an interface is assigned to a Link Aggregation Group, its configuration is governed by
the Link Aggregation master interface and it cannot be configured independently. In the
Interface Settings table, the interface's zone is displayed as "Aggregate Port" and the
configuration icon is removed.
5. Set the Link Speed for the interface to Auto-Negotiate.
6. Click OK.
Note Link Aggregation requires a matching configuration on the Switch. The switch's method of
load balancing will very depending on the vendor. Consult the documentation for the switch
for information on configuring Link Aggregation. Remember that it may be referred to as Port
Channel, Ether Channel, Trunk, or Port Grouping.
Port Redundancy
Port Redundancy provides a simple method for configuring a redundant port for a physical
Ethernet port. This is a valuable feature, particularly in high-end deployments, to protect
against switch failures being a single point of failure.
When the primary interface is active, it processes all traffic to and from the interface. If the
primary interface goes down, the backup interface takes over all outgoing and incoming traffic.
The backup interface assumes the MAC address of the primary interface and sends the
appropriate gratuitous ARP on a failover event. When the primary interface comes up again, it
resumes responsibility for all traffic handling duties from the backup interface.
In a typical Port Redundancy configuration, the primary and backup interfaces are connected
to different switches. This provides for a failover path in case the primary switch goes down.
Both switches must be on the same Ethernet domain. Port Redundancy can also be configured
with both interfaces connected to the same switch.