08-18-2016 12:30 AM
It's used to aggregate ports for redundancy.
Say you have controller and a stack with 2 members. The ports used by member 1 and member 2 are an aggregate as well. You can connect port 1 to member 1 and port 2 to member 2. When member 1 fails, you'll still have the port 2/member 2 connection.
08-18-2016 06:27 AM
What is the concept of building port channels in aruba controller and its purpose of using?
Port Channels can be used for redundancy, but to also increase the bandwidth between two devices. Aruba typically advises that the controller should have a 1 gig connection to your switch for each 100 APs that you have connected to a controller. If you have 200 APs on a controller but you do not have a 10 gig switch, you would port-channel two gigabit ports between an Aruba Controller and a switch to increase your bandwidth. Port Channels can be configured using LACP (dynamic port channel) or as a static port channel.
Configuring a static port channel: http://www.arubanetworks.com/techdocs/ArubaOS_6.4.4.x_WebHelp/Web_Help_Index.htm#ArubaFrameStyles/1CommandList/interface_port_channel.htm?Highlight=port channel
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