Link Aggregation
Note
-Link Aggregation is supported on the LX series, all virtual platforms, and on legacy E250GX systems
only
.
Link aggregation combines multiple physical interfaces into a single aggregated (or, logical)
interface, providing increased bandwidth as well as link redundancy. Traffic is distributed evenly
over the physical links of the aggregation group; and, if one of the links in the aggregated
interface becomes unavailable, traffic will continue to flow over the available interfaces in the
group.
Link Aggregation Protocol (LACP)
LACP is a protocol used between network devices to automatically bundle links between the
devices, and is supported by link aggregation. Once you configure an aggregated interface with
LACP enabled, LACP packets are broadcast to other directly connected devices (such as switches
and routers), which will create the necessary aggregated links (if they are also enabled for LACP).
Aggregated links on other network devices must be manually created on those devices if either
LACP is disabled on the aggregated interface you create, or if a network device does not support
LACP.
LACP supports active mode only; passive mode LACP is not supported.
General Process for Creating Aggregated Interfaces
1. Configuration of aggregated interfaces via the CLI/GUI by specifying:
a. A unique aggregated interface name.
b. The physical interfaces (ports) to be configured as members of the aggregated inter-
face.
c. A flag indicating whether LACP is to be enabled or disabled (it is enabled by default).
2. Assign the aggregated interface to a VLAN by adding an interface instance of the
aggregation group to the VLAN
Limitations
1. A maximum of 4 physical interfaces may be combined into one aggregated interface.
2. A physical interface may belong to no more than 1 aggregated interface.
3. An aggregated interface may be specified as an untagged interface in no more than one
VLAN. (There are no limitations for aggregated interfaces used as tagged interfaces; in
other words, an aggregated interface may be specified as a tagged interface in multiple
VLANs).
4. When assigning interfaces (physical or aggregated) to a VLAN, only one interface (physical
or aggregated) can be assigned to a VLAN. In other words, if you want to assign two
physical interfaces to the same VLAN, you must first create an aggregated interface
containing those two physical interfaces, and then assign the aggregated interface to the
VLAN.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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Equalizer Administration Guide
Summary of Contents for Equalizer GX Series
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