Guidelines And Limitations For Port Channel Configuration - Cisco nexus 5000 series Configuration Manual

Guidelines and Limitations for Port Channel Configuration

channels. For information on port channel configuration limits, see the Verified Scalability document for your
platform. For more information about load balancing, see
Cisco NX-OS does not support Port Aggregation Protocol (PAgP) for port channels.
Note
A port channel bundles individual links into a channel group to create a single logical link that provides the
aggregate bandwidth of several physical links. If a member port within a port channel fails, traffic previously
carried over the failed link switches to the remaining member ports within the port channel.
Each port can be in only one port channel. All the ports in a port channel must be compatible; they must use
the same speed and operate in full-duplex mode. When you are running static port channels without LACP,
the individual links are all in the on channel mode; you cannot change this mode without enabling LACP.
You cannot change the mode from ON to Active or from ON to Passive.
Note
You can create a port channel directly by creating the port-channel interface, or you can create a channel
group that acts to aggregate individual ports into a bundle. When you associate an interface with a channel
group, Cisco NX-OS creates a matching port channel automatically if the port channel does not already exist.
You can also create the port channel first. In this instance, Cisco NX-OS creates an empty channel group with
the same channel number as the port channel and takes the default configuration.
Note A port channel is operationally up when at least one of the member ports is up and that port's status is
channeling. The port channel is operationally down when all member ports are operationally down.
Guidelines and Limitations for Port Channel Configuration
Port channels can be configured in one of two ways: either in global configuration mode or in switch profile
mode. Consider the following guidelines and limitations when configuring port channels via the configuration
synchronization feature in Cisco NX-OS:
• Once a port channel is configured using switch profile mode, it cannot be configured using global
• Shutdown and no shutdown can be configured in either global configuration mode or switch profile
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.1(3)N1(1)
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configuration (config terminal) mode.
Several port channel sub-commands are not configurable in switch profile mode. These
Note
commands can be configured from global configuration mode even if the port channel
is created and configured in switch profile mode.
For example, the following command can only be configured in global configuration
mode:
switchport private-vlan association trunk primary-vlan secondary-vlan
mode.
Configuring Port Channels
Load Balancing Using Port Channels, on page 82.
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