Guidelines And Limitations; Port Index Limitations - Cisco MDS 9000 Series Configuration Manual

Configuring Fibre Channel Interfaces

Guidelines and Limitations

Port Index Limitations

Note Generation 1 and Generation 2 modules are not supported in Cisco MDS NX-OS Release 8.1(x).
Cisco MDS 9000 switches allocate index identifiers for the ports on the modules. These port indexes cannot
be configured. You can combine Generation 1, Generation 2, Generation 3, and Generation 4 switching
modules, with either Supervisor-1 modules or Supervisor-2 modules. However, combining switching modules
and supervisor modules has the following port index limitations:
• Supervisor-1 modules only support a maximum of 252 port indexes, regardless of the type of switching
• Supervisor-2 modules support a maximum of 1020 port indexes when all switching modules in the chassis
• Supervisor-2 modules only support a maximum of 252 port indexes when only Generation 1 switching
Note On a switch with the maximum limit of 252 as port index, any new module that exceeds the limit does not
power up when installed.
You can use the show port index-allocation command to display the allocation of port indexes on the switch.
switch# show port index-allocation
Module index distribution:
------------------------------------------------------+
Slot | Allowed |
-----------|---------|-------|-----------------------|
1
2
3
4
5
6
9
10
11
12
13
SUP
When a module does not power up because of a resource limitation, you can display the reason by using the
show module command.
modules.
are Generation 2 or Generation 3.
modules, or a combination of Generation 1, Generation 2, Generation 3, or Generation 4 switching
modules are installed in the chassis.
Allotted indices info
| range | Total |
| ----- | - | (None)
| ----- | - | (None)
| ----- | - | (None)
| ----- | - | (None)
| 0-1023| 32 | 0-31
| ----- | - | (None)
| ----- | - | (None)
| ----- | - | (None)
| ----- | - | (None)
| ----- | - | (None)
| 0-1023| 48 | 32-79
| 253-255 | 3 | 253-255
|
Index values |
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Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
Guidelines and Limitations
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