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22-25
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
Combining Generation 1, Generation 2, and Generation 3 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.
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.
Generation 1 switching modules have specific numbering requirements. If these requirements are not
met, the module does not power up. The port index numbering requirements include the following:
• If port indexes in the range of 256 to 1020 are assigned to operational ports, Generation 1 switching
modules do not power up.
• A block of contiguous port indexes is available. If this block of port indexes is not available,
Generation 1 modules do not power up. Table 22-19 shows the port index requirements for the
Generation 1 modules.
Note If the switch has Supervisor-1 modules, the block of 32 contiguous port indexes must begin on the slot
boundary. The slot boundary for slot 1 is 0, for slot 2 is 32, and so on. For Supervisor-2 modules, the
contiguous block can start anywhere.
The allowed mix of Generation 1 and Generation 2 switching modules in a chassis is determined at
run-time, either when booting up the switch or when installing the modules. In some cases, the sequence
in which switching modules are inserted into the chassis determines if one or more modules is powered
up. When a module does not power up because of a resource limitation, you can see the reason by
viewing the module information in the Information pane.
For information on recovering a module powered-down because port indexes are not available, refer to
the Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x.
Table 22-19 Port Index Requirements for Generation 1 Modules
Generation 1 Module
Number of Port Indexes Required
Supervisor-1 Module Supervisor-2 Module
16-port 2-Gbps Fibre Channel module 16 16
32-port 2-Gbps Fibre Channel module 32 32
8-port Gigabit Ethernet IP Storage Services module 32 32
4-port Gigabit Ethernet IP Storage Services module 32 16
32-port 2-Gbps Fibre Channel Storage Services
Module (SSM).
32 32
14-port Fibre Channel/2-port Gigabit Ethernet
Multiprotocol Services (MPS-14/2) module
32 22
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