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Configuring Dynamic Link Aggregation Dynamic Link Aggregation Overview
OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 14-7
Dynamic Link Aggregation Overview
Link aggregation allows you to combine 2, 4, or 8 physical connections into large virtual connections
known as link aggregation groups. You can configure up to 32 link aggregation groups per a standalone
switch or a stack of switches. Each group can consist of 2, 4, or 8 10-Mbps, 100-Mbps, 1-Gbps, or 10-
Gbps Ethernet links.
You can create Virtual LANs (VLANs), 802.1Q framing, configure Quality of Service (QoS) conditions,
and other networking features on link aggregation groups because switch software treats these virtual links
just like physical links. (See “Relationship to Other Features” on page 14-9 for more information on how
link aggregation interacts with other software features.)
Link aggregation groups are identified by unique MAC addresses, which are created by the switch but can
be modified by the user at any time. Load balancing for Layer 2 non-IP packets is on a MAC address basis
and for IP packets the balancing algorithm uses the IP address as well. Ports must be of the same speed
within the same aggregate group.
Alcatel’s link aggregation software allows you to configure the following two different types of link
aggregation groups:
Static link aggregate groups
Dynamic link aggregate groups
This chapter describes dynamic link aggregation. For information on static link aggregation, please refer
to Chapter 13, “Configuring Static Link Aggregation.”
Dynamic Link Aggregation Operation
Dynamic aggregate groups are virtual links between two nodes consisting of 2, 4, or 8 10-Mbps, 100-
Mbps, or 1-or 10-Gbps fixed physical links. Dynamic aggregate groups use the standard IEEE 802.3ad
Link Aggregation Control Protocol (LACP) to dynamically establish the best possible configuration for
the group. This task is accomplished by special Link Aggregation Control Protocol Data Unit (LACPDU)
frames that are sent and received by switches on both sides of the link to monitor and maintain the
dynamic aggregate group.
The figure on the following page shows a dynamic aggregate group that has been configured between
Switch A and Switch B. The dynamic aggregate group links four ports on Switch A to four ports on
Switch B.
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