Brocade FICON Administrator's Guide v7.1.0 (53-1002753-01, March 2013)

28 FICON Administrator’s Guide

53-1002753-01

Addressing modes

NOTE

Although port addresses are assigned when moved to a logical switch, the address is not bound to

the port. To ensure that the link address for a control unit attached to a port does not change, the

portAddress command must be used to bind the address to the port even if you are not changing

the port address assignments. Refer to “Sequential address binding” on page 89 for a list of

commands that will bind ports on DCX or DCX 8510-8 Backbones fully populated with 32-port

blades.

Mode 2 (port-based addressing)

Port based addressing follows a default port numbering scheme that starts with 00 for the port on

the bottom left-most column of the blade in slot 1 and increments for each port going up the blade.

For a DCX and DCX 8510-8 Backbone, the right-most port column on the blade starts with 0x80,

and port numbering increments going up the blade. Subsequent blade slots follow the same port

numbering scheme with an offset of 0x80. The ALPA is always 0x00 except on the 48-port blades.

The 48-port blades use bits in the ALPA for the upper 16 ports on bladed switches that support

more than 256 ports. This is why the 48-port blade in the DCX and DCX 8510-8 Backbones is only

supported with zero-based addressing. The DCX-4S and DCX 8510-4 Backbones do not use the

ALPA bits with the 48-port blades. Port-based addressing is used in a Brocade switch or backbone

not enabled for virtual fabrics.

Refer to“Zero-Based to Port-Based Address Binding” on page 95 for a list of commands that will

allow DCX or DCX 8510-8 Backbones fully populated with 32-port blades that are configured for

zero-based addressing to use port-based addresses.

Changing the addressing mode

Changing the addressing mode can have serious implications. After changing the addressing

mode, the following actions occur:

• Physical ports can receive new area assignments.

• Port addresses that are referenced in an IOCDS gen can be associated with entirely new

physical ports.

To change the addressing mode, use the following procedure.

NOTE

To access all parameters controlled by the configure command, you must disable the switch. Any

configuration change to a logical switch that requires disabling the switch also requires disabling

FMS mode.

1. Disable FMS mode using the ficonCupSet fmsmode disable command.

2. Disable the switch using the switchDisable command.

3. Change the address mode using the configure command.

The configure command runs in interactive mode and presents you with a series of hierarchical

menus. To change the address mode, select the Fabric parameters menu, then select the

Enable a 256 Area Limit field and enter appropriate option values. For more information on

this command and an example of command output, refer to the Fabric OS Command

Reference Manual.

4. Enable the switch using the switchEnable command.