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21-22
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 21 Configuring N Port Virtualization
Configuring NPV
The ISLs are considered in the second method. The selection algorithm spreads out the free port
selections, so that the first port in every four ports is selected, for example, the 1st, 5th, 9th, etc. If after
going through the 1st port in every four ports, you still have not selected enough ports (because the
preferred ports were not free) then move to the second port in every four, for example, the 2nd, 6th, 10th
etc. Different switches have different port preferences.
Ports on the NPIV switch are selected in the following way:
During automatic port selection on the NPIV switch free ports are defined as ports that are licensed FC
ports and ports that have "Operational status" = Auto and "Status Cause" =none(2), offline(8) or sfp not
present(29). If the ports are found in any other operational state, (for example F, NP, E, TE etc), then
they are considered used, except for E and TE ports that are in ISLs connected to NPV device switches
that will be enabled for NPV mode in this wizard session, as they will be considered to be free.
However, these ISL ports will not necessarily be the ports selected by the automatic port selection
algorithm as they are treated no different then any other free port. If you want to convert those used
ISL ports, then choose the Convert existing ISLs option first and then run the wizard a second time
choosing Automatic port selection (option 2) to add additional links.
When you choose to configure ports from available ports, the wizard searches for ports that are not
currently participating in NP link configuration. It is possible that all ports can be participating in NP
port configuration. In that case a warning message is displayed. (See Figure 21-19.)
Note In both manual and automatic methods of Configuring NPV associated ports, the ports that are unhealthy
or which are in adminDown state are not considered during port selection.
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