On 5508 WLC you can bundle up to 8 ports into a single link. On 25 WLCs you can bundle all 4 ports into a single link.While LAG is the preferred method of connecting the WLC to the network there however a number of restrictions we need to be aware of to ensure we don’t stumble into any unpleasant surprises. Link Aggregation Restrictions - Considerations Understand how WLCs work, Wi-Fi SSID/VLAN Mappings WLC Interfaces, Ports & Functionality.Cisco WLC Basic Concepts, WLC Models, and GUI Interface.Configuring Switch to Support Link Aggregation.Wireless Controller LAG Configuration – Enabling LAG.Link Aggregation Restrictions and Considerations.In the configuration below WLC ports P1 and P2 are aggregated to provide a total of 2Gbps bandwidth: The diagram below shows an example of a WLC 2504 with ports P1 and P2 in a LAG configuration connecting to a Cisco Catalyst or Nexus switch. To learn more about WLC interfaces refer to our article Cisco WLC Interfaces, Ports & Their Functionality article This helps simplify the configuration of the WLC interface ports, increase available bandwidth between the wireless and wired network, provide load-balancing capabilities between physical WLC ports and increase port redundancy. Cisco Wireless Controllers ( WLC) support the configuration of Link Aggregation ( IEEE 802.3ad - LAG) which bundles the controller ports into a single port channel.
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