Cisco Systems DSC9148D8G48PK9 manual Local Switching Limitations, Port Index Limitations

Chapter 3 Configuring Fibre Channel Interfaces

Guidelines and Limitations

Note When a Cisco or another vendor switch port is connected to a Generation 1 module port (ISL connection), the receive buffer-to-buffer credits of the port connected to the Generation 1 module port must not exceed 255.

Local Switching Limitations

•All ports in the module must be in shared mode. Use the switchport ratemode shared command to ensure that all the ports in the module are in shared mode.

•No E ports are allowed in the module because E ports must be in dedicated mode.

Port Index Limitations

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 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, Generation 3, or Generation 4 switching modules are installed in the chassis.

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-allocationcommand to display the allocation of port indexes on the switch.

switch# show port index-allocation

	Module index distribution:
	------------------------------------------------------						+
	Slot Allowed				Allotted indices info
		range	Total			Index values
----		---------		-------	------------------------------
1		-----		-	(None)
2		-----		-	(None)
3		-----		-	(None)
4		-----		-	(None)
5		0-1023		32	0-31
6		-----		-	(None)
9		-----		-	(None)
10		-----		-	(None)
11		-----		-	(None)
12		-----		-	(None)
13		0-1023		48	32-79
	SUP 253-255			3	253-255
						Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
	OL-29284-01, Release 6.x							3-19