Cisco Nexus 5000 Series - Page 92

• source-mac—Loads distribution on the source MAC address.
• source-port—Loads distribution on the source port.
Use the option that provides the balance criteria with the greatest variety in your configuration. For example,
if the traffic on an EtherChannel is going only to a single MAC address and you use the destination MAC
address as the basis of EtherChannel load balancing, the EtherChannel always chooses the same link in that
EtherChannel; using source addresses or IP addresses might result in better load balancing.
Beginning with Cisco NX-OS Release 5.0(3)N2(1), the Cisco Nexus 5548 switch and Cisco Nexus 5596
switch support 8 hash polynomials that can be used for compression on the hash-parameters
(software-configurable selection of source and destination MAC addresses, source and destination IP addresses,
and source and destination TCP and UDP ports). Depending on variations in the load-balancing method for
egress traffic flows from a port channel, different polynomials could provide different load distribution results.
The valid load-balancing hash-polynomial values are as follows:
• CRC8a—Hash polynomial CRC8a.
• CRC8b—Hash polynomial CRC8b.
• CRC8c—Hash polynomial CRC8c.
• CRC8d—Hash polynomial CRC8d.
• CRC8e—Hash polynomial CRC8e.
• CRC8f—Hash polynomial CRC8f.
• CRC8g—Hash polynomial CRC8g.
• CRC8h—Hash polynomial CRC8h.
The hash polynomial that you choose affects both the multicast and unicast traffic egressing from all the
local port channels. The hash polynomial does not affect the port channels whose member ports are on a
Cisco Nexus 2148T Fabric Extender, Cisco Nexus 2232P Fabric Extender, or Cisco Nexus 2248T Fabric
Extender.
Note
Examples
This example shows how to set the load-balancing method to use the source IP:
switch(config)#
port-channel load-balance ethernet source-ip
This example shows how to set the load-balancing method to use the source IP and the CRC8c polynomial
to hash a flow to obtain a numerical value that can be used to choose the egress physical interface on a Cisco
Nexus 5548 switch:
switch(config)#
port-channel load-balance ethernet source-ip CRC8c
Related Commands
DescriptionCommand
Displays information on EtherChannel load balancing.show port-channel load-balance
Cisco Nexus 5000 Series Interfaces Command Reference
82
P Commands
port-channel load-balance ethernet