Port Indexes - Cisco MDS 9000 Series Configuration Manual

Chapter 3 Configuring Fibre Channel Interfaces
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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When a Cisco or a other vendor switch port is connected to a Generation 1 module port (ISL
Note
connection), the receive buffer-to-buffer credits of the port connected to the Generation 1 module port
must not exceed 255.

Port Indexes

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, and Generation 3 switching
modules, with either Supervisor-1 modules or Supervisor-2 modules. However, combining switching
modules and supervisor modules has the following port index limitations:
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Note On a switch with the maximum limit of 252 port index maximum limit, any new module that exceeds the
limit when installed does not power up.
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
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)
4-Port IP Storage Services module
–
8-Port IP Storage Services module
–
MDS 9216 Switch
–
MDS 9216A switch
–
MDS 9020 switch
–
MDS 9120 switch
–
MDS 9140 swtich
–
Supervisor-1 modules must be upgraded to Supervisor-2 modules on the MDS 9506 and MDS 9509
Directors.
IPS-4 and IPS-8 modules must be upgraded to the MSM-18/4 Multiservice modules.
Fabric 1 modules must be upgraded to Fabric 2 modules on the MDS 9513 Director to use the
48-port or the 24-port 8-Gbps module.
Supervisor-1 modules only support a maximum of 252 port indexes, regardless of the type of
switching modules.
Supervisor-2 modules support a maximum of 1020 port indexes when all switching modules in the
chassis are Generation 2 or Generation 3.
Supervisor-2 modules only support a maximum of 252 port indexes when only Generation 1
switching modules, or a combination of Generation 1, Generation 2, or Generation 3 switching
modules, are installed in the chassis.
Alloted indices info
| range | Total |
| 0- 255| 16 | 32-47
| 0- 255| 12 | 0-11
| 0- 255| - | (None)
Combining Generation 1, Generation 2, and Generation 3 Modules
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Index values |
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Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
3-9