Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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14-4
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 14 Configuring SAN Port Channels
Information About SAN Port Channels
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
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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