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6-8
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 6 Configuring Port Channels
Information About Port Channels
• Multicast traffic without Layer 4 information—Source IP address, destination IP address
• Non-IP multicast traffic—Source MAC address, destination MAC address
Note Devices that run Cisco IOS were able to optimize the behavior of the member ports ASICs if a failure
of a single member occurred by running the port-channel hash-distribution command. The Cisco
Nexus 7000 Series device performs this optimization by default and does not require or support this
command. Cisco NX-OS does support the customization of the load-balancing criteria on port channels
through the port-channel load-balance command, either for the entire device or on a per-module basis.
See the Cisco Nexus 7000 Series NX-OS Interfaces Command Reference, Release 5.x, for information on
this command.
LACP
LACP allows you to configure up to 16 interfaces into a port channel. A maximum of 8 interfaces can
be active, and a maximum of 8 interfaces can be placed in a standby state on the M Series modules.
Beginning with Cisco NX-OS Release 5.1, you can bundle up to 16 active links into a port channel on
the F Series module.
This section includes the following topics:
• LACP Overview, page 6-8
• Port-Channel Modes, page 6-9
• LACP ID Parameters, page 6-10
• LACP Marker Responders, page 6-11
• LACP-Enabled and Static Port Channels Differences, page 6-11
• LACP Compatibility Enhancements, page 6-12
• LACP Port-Channel MinLinks and MaxBundle, page 6-12
• LACP Offload to Fabric Extenders, page 6-13
• LACP Fast Timers, page 6-13
LACP Overview
Note You must enable LACP before you can use LACP. By default, LACP is disabled.
See the “Enabling LACP” section on page 6-29 for information on enabling LACP.
Beginning in Cisco NX-OS Release 4.2, the system automatically takes a checkpoint before disabling
the feature, and you can roll back to this checkpoint. See the Cisco Nexus 7000 Series NX-OS System
Management Configuration Guide, Release 5.x, for information on rollbacks and checkpoints.
Figure 6-2 shows how individual links can be combined into LACP port channels and channel groups as
well as function as individual links.
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