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Load Balancing
Traffic forwarded to a LAG is load-balanced across the active member ports,
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thus achieving an effective bandwidth close to the aggregate bandwidth
of all the active member ports of the LAG .
•
Traffic load balancing over the active member ports of a LAG is managed by
a hash-based distribution function that distributes Unicast and Multicast
traffic based on Layer 2 or Layer 3 packet header information .
•
The device supports two modes of load balancing:
By MAC Addresses—(Default) Based on the destination and source MAC
•
•
addresses of all packets .
By IP and MAC Addresses—Based on the destination and source IP
•
addresses for IP packets, and destination and source MAC addresses for
non-IP packets .
LAG Management
In general, a LAG is treated by the system as a single logical port . In particular,
the LAG has port attributes similar to a regular port, such as state and speed .
The device supports four LAGs . Every LAG has the following characteristics:
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All ports in a LAG must be of the same media type .
To add a port to the LAG, it cannot belong to any VLAN except the default
•
VLAN .
•
Ports in a LAG must not be assigned to another LAG .
No more than eight ports are assigned to a static LAG and no more than 16
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ports can be candidates for a dynamic LAG .
All the ports in a LAG must have auto-negotiation disabled, although the
•
LAG can have auto-negotiation enabled .
When a port is added to a LAG, the configuration of the LAG is applied to
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the port . When the port is removed from the LAG, its original configuration
is reapplied .
Protocols, such as Spanning Tree, consider all the ports in the LAG to be
•
one port .
Default Settings and Configuration
Ports are not members of a LAG and are not candidates to become part of a LAG .
Static and Dynamic LAG Workflow
After a LAG has been manually created, LACP cannot be added or removed
until the LAG is edited and a member is removed . Only then the LACP field is
activated .
To configure a static LAG, perform the following actions:
•
1 .
Disable LACP on the LAG to make it static . Assign up to eight member
ports to the static LAG in the Port List to the LAG Port Member list . Perform
these actions in the LAGs page .
2 .
Configure various aspects of the LAG, such as speed and flow control by
using the Edit LAG page .
To configure a dynamic LAG, perform the following actions:
1 .
Enable LACP on the LAG . Assign up to 16 candidates ports to the dynamic
LAG by selecting and moving the ports from the Port List to the LAG Port
Member List by using the LAGs page .
2 .
Configure various aspects of the LAG, such as speed and flow control by
using the LAGs page .
LAGs
The LAGs page displays global and per-LAG settings . The page also enables you
to configure the global settings and to select and edit the desired LAG on the
Edit LAG Membership page .
To define the member or candidate ports in a LAG .
•
STEP 1 Click Configuration > Port Management > Link Aggregation > LAGs .
Information for each defined LAG is displayed .
STEP 2 Select the Load Balance Method:
•
by MAC Address—(Default) Based on the destination and source MAC
addresses of all packets .
•
by IP and MAC Address—Based on the destination and source IP addresses
for IP packets, and destination and source MAC addresses for non-IP packets .
Chapter 5 Port Management
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