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Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 14 Configuring PortChannels
Considerations for PortChannel Configurations
Figure 14-4
illustrates how exchange based load balancing works. When the first frame in an exchange
is received for forwarding on an interface, link 1 is chosen by a hash algorithm. All remaining frames in
that particular exchange are sent on the same link. For exchange 1, no frame uses link 2. For the next
exchange, link 2 is chosen by the hash algorithm. Now all frames in exchange 2 use link 2.
Figure 14-4
SID1, DID1, and Exchange Based Load Balancing
Considerations for PortChannel Configurations
Before configuring a PortChannel, consider the following guidelines
•
Configure the PortChannel across switching modules to prevent redundancy on switching module
reboots or upgrades.
•
Ensure that one PortChannel is not connected to two switches. PortChannels require point-to-point
connections.
Error Detection
If you misconfigure PortChannels, you may receive the “Error disabled - Possible port channel
misconfiguration” message. If you receive this message, the PortChannel’s physical links are disabled
since an error has been detected.
A PortChannel error is detected if the following requirements are not met:
•
Each switch on either side of a PortChannel must be connected to the same number of interfaces.
•
Each interface must be connected to a corresponding interface on the other side.
Frame 1
Frame 2
Frame 3
Frame 1
Frame 2
Frame 3
Frame n
Frame n
SID1, DID1,
Exchange 1
SID1, DID1,
Exchange 2
Link 1
Link 2
Link 1
Link 2
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