Member ports of a LAG are added and programmed into the hardware in a predictable order based on the port ID, instead of in theorder in which the ports come up. With this implementation, load balancing yields predictable results across line card resets andchassis reloads.A physical interface can belong to only one port channel at a time.Each port channel must contain interfaces of the same interface type/speed.Port channels can contain a mix of 1G/10G/40G. The interface speed (10, 100, or 1000 Mbps) the port channel uses is determinedby the first port channel member that is physically up. Dell Networking OS disables the interfaces that do match the interface speedthat the first channel member sets. That first interface may be the first interface that is physically brought up or was physicallyoperating when interfaces were added to the port channel. For example, if the first operational interface in the port channel is aGigabit Ethernet interface, all interfaces at 1000 Mbps are kept up, and all 10/100/1000 interfaces that are not set to 1000 speed orauto negotiate are disabled.Dell Networking OS brings up the interfaces interfaces that are set to auto negotiate so that their speed is identical to the speed ofthe first channel member in the port channel.Interfaces in Port ChannelsWhen 10/40 Gbps interfaces are added to a port channel, the interfaces must share a common speed. When interfaces have aconfigured speed different from the port channel speed, the software disables those interfaces.The common speed is determined when the port channel is first enabled. At that time, the software checks the first interface listedin the port channel configuration. If you enabled that interface, its speed configuration becomes the common speed of the portchannel. If the other interfaces configured in that port channel are configured with a different speed, Dell Networking OS disablesthem.Configuration Tasks for Port Channel InterfacesTo configure a port channel (LAG), use the commands similar to those found in physical interfaces. By default, no port channels areconfigured in the startup configuration.These are the mandatory and optional configuration tasks:• Creating a Port Channel (mandatory)• Adding a Physical Interface to a Port Channel (mandatory)• Reassigning an Interface to a New Port Channel (optional)• Configuring the Minimum Oper Up Links in a Port Channel (optional)• Adding or Removing a Port Channel from a VLAN (optional)• Assigning an IP Address to a Port Channel (optional)• Deleting or Disabling a Port Channel (optional)• Load Balancing Through Port Channels (optional)Creating a Port ChannelYou can create up to 128 port channels with up to 16 port members per group on the platform.To configure a port channel, use the following commands.1. Create a port channel.CONFIGURATION modeinterface port-channel id-number2. Ensure that the port channel is active.INTERFACE PORT-CHANNEL modeno shutdown378 Interfaces
