FibeAir IP-20C/S/E
User Guide
Ceragon Proprietary and Confidential
Page 78 of 597
3.4
Configuring Link Aggregation (LAG)
Link aggregation (LAG) enables you to group several physical Ethernet or
radio interfaces into a single logical interface bound to a single MAC address.
This logical interface is known as a LAG group. Traffic sent to the interfaces in
a LAG group is distributed by means of a load balancing mechanism. IP-20
uses a distribution function of up to Layer 4 in order to generate the most
efficient distribution among the LAG physical ports.
This section explains how to configure LAG and includes the following topics:
3.4.1
LAG Overview
LAG can be used to provide redundancy for Ethernet interfaces, both on the
same IP-20 unit (line protection) and on separate units (line protection and
equipment protection). LAGs can also be used to provide redundancy for radio
links.
LAG can also be used to aggregate several interfaces in order to create a wider
(aggregate) link. For example, LAG can be used to create a 4 Gbps channel.
You can create up to four LAG groups. The following restrictions exist with
respect to LAG groups:
Only physical interfaces (including radio interfaces), not logical interfaces,
can belong to a LAG group.
Interfaces can only be added to the LAG group if no services or service
points are attached to the interface.
Any classification rules defined for the interface are overridden by the
classification rules defined for the LAG group.
When removing an interface from a LAG group, the removed interface is
assigned the default interface values.
There are no restrictions on the number of interfaces that can be included in a
LAG. It is recommended, but not required, that each interface in the LAG have
the same parameters (e.g., speed, duplex mode).
The LAG page lists all LAG groups configured on the unit.
Note:
To add or remove an Ethernet interface to a LAG group, the
interface must be in an administrative state of “down”. This
restriction does not apply to radio interfaces. For
instructions on setting the administrative state of an
interface, see Enabling the Interfaces (Interface Manager).
