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23-4
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 23 Configuring PortChannels
About PortChannels
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F ports and NP ports
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TF ports and TNP ports
• Trunking—Trunking permits carrying traffic on multiple VSANs between switches.
See Chapter 26, “Configuring and Managing VSANs.”
• Both PortChanneling and trunking can be used between TE ports over EISLs.
About Load Balancing
Two mechanisms support the load balancing functionality:
• 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.
Figure 23-4 illustrates how source ID 1 (SID1) and destination ID1 (DID1) based load balancing works.
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.
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