Cisco Systems MDS 9500 Series manual Example 1-1 Borrowing Port Indexes from Another Slot

Chapter 1 Product Overview

Port Index Availability

Se 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 ck - d o c @ c i s c o . c o m .

means that while there may be enough port indexes available for a Generation 1 module, the module may not boot up because the available port indexes are not in a contiguous range or the contiguous block does not start at the first port index for a given slot.

Example 1-1shows a scenario with a Supervisor-1 module, where a 48-port Generation 2 module borrowed port indexes from the first slot. Slot 1 still has 16 port indexes available, but the full 32 indexes are no longer available (28-31 are used by the module in slot 4). This means that no Generation 1 module except a 16-port Fibre Channel switching module can be inserted into slot 1 because some of the port indexes for the slot are already in use.

Example 1-1 Borrowing Port Indexes from Another Slot

switch# show port index-allocation
Module	index distribution:
---------------------------------------------------							+
Slot	Allowed				Alloted indices info
		range* Total				Index values
-------		---------		-------		-------------------------
1		0-	31	-		-
2		32-	63	32		32-63
3		64-	95	48		64-95,224-239
4		96- 127		48		96-127, 240-252, 28-31
7		128- 159		32		128-159
8		160- 191		32	160-191
9		192- 223		32	192-223
SU		253-255		3		253-255
*Allowed		range applicable only for Generation-1 modules

Using any combination of modules that include a Generation 1 module and a Supervisor-2 module limits the port index availability to 252 on all Cisco MDS 9500 Series Directors. The Generation 1 modules can use any contiguous block of port indexes that start on the first port index reserved for any slot in the range 0-252. (See Table 1-9.)

Using any combination of only Generation 2 with a Supervisor-2 module allows a maximum of 528 (with an architectural limit of 1020) port indexes on all Cisco MDS 9500 Series Directors. Generation 2 modules do not need contiguous port indexes. Generation 2 modules use the available indexes in the slot that it is installed and then borrow available indexes from the supervisors. If the module requires more indexes, it starts borrowing available indexes from slot 1 of the chassis until it has the number of port indexes necessary.

Note Enter the purge module CLI command to free up reserved port indexes after you remove a module.

	Cisco MDS 9500 Series Hardware Installation Guide
OL-17467-02		1-29