FortiGate Version 3.0 MR4 Administration Guide
76 01-30004-0203-20070102
Interface System Network
Figure 29: Settings for an 802.3ad aggregate interface
To create an 802.3ad Aggregate interface
1 Go to System > Network > Interface.
2 Select Create New.
3 In the Name field, enter a name for the aggregated interface.
The interface name must not be the same as any other interface, zone or VDOM.
4 From the Type list, select 802.3ad Aggregate.
5 One at a time, in the Available Interfaces list, select each interface that you want
to include in the aggregate interface and then select the right arrow button to
move it to the Selected Interfaces list.
6 If this interface operates in NAT/Route mode, you need to configure addressing
for it. For information about dynamic addressing, see:
• “Configuring DHCP on an interface” on page 78
• “Configuring an interface for PPPoE or PPPoA” on page 80
7 Configure other interface options as required.
8 Select OK.
Creating a redundant interface
You can combine two or more physical interfaces to provide link redundancy. This
feature allows you to connect to two or more switches to ensure connectivity in the
event one physical interface or the equipment on that interface fails.
Redundant links differ from link aggregation in that traffic is only going over one
interface at any time (no matter how many are in the redundant link), but
redundant interfaces allow for more robust configurations with fewer possible
points of failure. This is important in a fully meshed HA configuration.
FortiGate firmware on models 800 and higher implements redundant interfaces.
An interface is available to be in a redundant interface only if
• it is a physical interface, not a VLAN interface
• it is not already part of an aggregated or redundant interface
• it is in the same VDOM as the redundant interface
• it has no defined IP address and is not configured for DHCP or PPPoE
• it has no DHCP server or relay configured on it
• it does not have any VLAN subinterfaces
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