Link Aggregation Configuration
This section contains a complete sample Link Aggregation Group configuration.
LACP is based on the 802.3ad IEEE specification. It allows bundling of several physical interfaces to form a single logical channel providing enhanced performance and redundancy. The aggregated interface is viewed as a single link to each switch. The spanning tree views it as one interface and not as two or three interfaces. When there is a failure in one physical interface, the other interfaces stay up and there is no disruption. Traffic can be load balanced within an LACP trunk group in a controlled manner using the hashing algorithm.The maximum number of physical Ethernet links in a single logical channel depends upon the hardware support.
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Physical interfaces inherit the properties of LAG port once it is attached to be part of LAG, irrespective of the configuration present on the physical interface. |
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In case of Dynamic and Static LAG, it is possible to move member ports from one LAG to another LAG. |
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Configure LAG port as a switch or router port, before adding member ports into it. |
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LAG configuration is not allowed on inactive subsidiary ports. Configuring LAG on subsidiary ports before executing port breakout commands on control ports causes issues. |
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Remove any LAG configuration from subsidiary ports before issuing the no port breakout command. |
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Switchport configuration is not allowed on inactive subsidiary ports. Applying switchport configuration on subsidiary ports before executing the port breakout command causes issues. |
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Do not execute the no port breakout command on subsidiary ports configured with switchport. |
Topology
In the following topology, 3 links are configured between the two switches SW1 and SW2. These three links are assigned the same administrative key (1) so that they aggregate to form a single channel 1. They are viewed by the STP as one interface.
Figure 7. LACP topology
