For example, you can connect two links to the master switch and the remaining links to the backup switch. As long as the master switch is active, the backup switch remains inactive. If the master switch fails, the backup switch takes over transparently.
Although this scenario adds redundancy that protects the server from becoming unavailable if the switch fails, it results in decreased bandwidth.
Setting Up Link Aggregation in Mac OS X Server
To set up your Mac OS X Server for link aggregation, you need a Mac with two or more IEEE
You create a link aggregate on your computer in the Network pane of System Preferences.
Installer application 
or
installer tool in Terminal application
To create a link aggregate:
1Log in to the server as an administrative user.
2Open System Preferences.
3Click Network.
4Click the Gear button and choose Manage Virtual Interfaces in the
5Click the Add (+) button, and select New Link Aggregate in the
Note: You only see this option if you have two or more Ethernet interfaces on your system.
6In the Name field, enter the name of the link aggregate.
7Select the ports to aggregate from the list.
8Click Create.
9Click Done.
By default the system gives the link aggregate the interface name bond<num>, where <num> is a number indicating precedence. For example, the first link aggregate is named bond0, the second is bond1, and the third is bond2.
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Chapter 7 Ongoing System Management
