Setup Guide

Up to 128 port- channels with sixteen 10GbE or 40GbE port members per channel are supported.
As soon as you congure a port channel, the system treats it like a physical interface. For example, IEEE 802.1Q tagging is maintained while
the physical interface is in the port channel.
Member ports of a LAG are added and programmed into the hardware in a predictable order based on the port ID, instead of in the order in
which the ports come up. With this implementation, load balancing yields predictable results across line card resets and chassis 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 10 or 40 Gigabit Ethernet interfaces. The interface speed (10, 40 Gbps) the port channel uses is
determined by the rst port channel member that is physically up. The system disables the interfaces that do match the interface speed
that the rst channel member sets. That rst interface may be the rst interface that is physically brought up or was physically operating
when interfaces were added to the port channel. For example, if the rst operational interface in the port channel is a 10–Gigabit Ethernet
interface, all interfaces at 40Gbps are kept up, and all 10/40 GbE interfaces that are not set to 10000 speed or auto negotiate are disabled.
The system brings up 10/40 GbE interfaces that are set to auto negotiate so that their speed is identical to the speed of the rst channel
member in the port channel.
10/40 Gbps Interfaces in Port Channels
When both 10/40 interfaces GigE interfaces are added to a port channel, the interfaces must share a common speed. When interfaces
have a congured speed dierent from the port channel speed, the software disables those interfaces.
The common speed is determined when the port channel is rst enabled. At that time, the software checks the rst interface listed in the
port channel conguration. If you enabled that interface, its speed conguration becomes the common speed of the port channel. If the
other interfaces congured in that port channel are congured with a dierent speed, the system disables them.
Conguration Tasks for Port Channel Interfaces
To congure a port channel (LAG), use the commands similar to those found in physical interfaces. By default, no port channels are
congured in the startup conguration.
These are the mandatory and optional conguration tasks:
• Creating a Port Channel (mandatory)
• Adding a Physical Interface to a Port Channel (mandatory)
• Reassigning an Interface to a New Port Channel (optional)
• Conguring 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 Channel
You can create up to 128 port channels with 16 port members per group on the switch.
To congure a port channel, use the following commands.
1 Create a port channel.
CONFIGURATION mode
Interfaces
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