About Load Balancing - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

About PortChannels
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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About Load Balancing

Two mechanisms support the load balancing functionality:
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Figure 17-4
When the first frame in a flow is received on an interface for forwarding, link 1 is selected. Each
subsequent frame in that flow is sent over the same link. No frame in SID1 and DID1 utilizes link 2.
Cisco MDS 9000 Family CLI Configuration Guide
17-4
– F ports and NP ports
TF ports and TNP ports
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Trunking—Trunking permits carrying traffic on multiple VSANs between switches.
See Chapter 20, "Configuring and Managing VSANs."
Both PortChanneling and trunking can be used between TE ports over EISLs.
Flow based—All frames between source and destination follow the same links for a given flow. That
is, whichever link is selected for the first exchange of the flow is used for all subsequent exchanges.
Exchange based—The first frame in an exchange picks a link and subsequent frames in the exchange
follow the same link. However, subsequent exchanges can use a different link. This provides more
granular load balancing while preserving the order of frames for each exchange.
illustrates how source ID 1 (SID1) and destination ID1 (DID1) based load balancing works.
Chapter 17 Configuring PortChannels
OL-18084-01, Cisco MDS NX-OS Release 4.x