Dell S4820T, Configuration Manual

Page: 443 / 1178

at 1000 Mbps are kept up, and all 10/100/1000 interfaces that are not set to 1000 speed or auto
negotiate are disabled.
Dell Networking OS brings up 10/100/1000 interfaces that are set to auto negotiate so that their speed is
identical to the speed of the first channel member in the port channel.
10/100/1000 Mbps Interfaces in Port Channels
When both 10/100/1000 interfaces and GigE interfaces are added to a port channel, the interfaces must
share a common speed. When interfaces have a configured 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 listed in the port channel configuration. If you enabled that interface, its speed
configuration becomes the common speed of the port channel. If the other interfaces configured in that
port channel are configured with a different speed, Dell Networking OS disables them.
For example, if four interfaces (TenGig 1/1, 1/2, 1/3 and 1/4) in which Gi 1/1 and Gi 1/2are set to speed
1000 Mb/s and the others (te 1/3 and 1/4)are set to 10000 Mb/s, with all interfaces enabled, and you add
them to a port channel by entering
channel-member tengigabitethernet 1/1-4
while in port
channel interface mode, and Dell Networking OS determines if the first interface specified (TenGig 1/1) is
up. After it is up, the common speed of the port channel is 1000 Mb/s. Dell Networking OS disables those
interfaces configured with speed 10000 Mb/s or whose speed is 10000 Mb/s as a result of auto-
negotiation.
In this example, you can change the common speed of the port channel by changing its configuration so
the first enabled interface referenced in the configuration is a 1000 Mb/s speed interface. You can also
change the common speed of the port channel here by setting the speed of the Te 1/1 interface to 1000
Mb/s.
Configuration Tasks for Port Channel Interfaces
To configure a port channel (LAG), use the commands similar to those found in physical interfaces. By
default, no port channels are configured 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)
Interfaces
443