Cisco MDS 9000 Series Configuration Manual page 279

Configuring N Port Virtualization
Connecting an NPIV-Enabled Cisco MDS Fabric Switch
When trunking is enabled on the NPV ports of any MDS switch (released before the Cisco MDS 9396S
Multilayer Fabric Switch) that runs on an Cisco MDS NX-OS Release 6.2(13) and earlier, and you connect
an NPIV enabled Cisco MDS 9396S Multilayer Fabric Switch, use ports fc1/1 through fc1/63.
Note Trunking failure can occur in both non-portChannel (individual physical NP uplinks) and portChannel NP
uplinks. To avoid trunking failure, ensure that you upgrade the NPV switch to Cisco MDS NX-OS Release
6.2(13) or later.
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
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