Cisco Systems DSC9148D8G48PK9 Dedicated Rate Mode, Part Number Description Mode Mode on All Ports

Chapter 3 Configuring Fibre Channel Interfaces

Information About Fibre Channel Interfaces

Table 3-3	Port Rate Mode Support on Generation 2, Generation 3, and Generation 4 Modules
	and Switches (continued)
			Supports	Supports	Default Speed
		Product Name/	Dedicated Rate	Shared Rate	Mode and Rate
Part Number		Description	Mode	Mode	Mode on All Ports
DS-C9134-K9		32-port 4-Gbps Fabric	Yes	Yes	Auto, Shared
(Cisco MDS 9134		switch
Fabric switch)		2-port 10-Gbps Fabric	Yes	No	Auto, Dedicated
		switch
DS-C9124-K9		24-port 4-Gbps Fabric	Yes	No	Auto, Dedicated
(Cisco MDS 9124		switch4
Fabric switch)
DS-C9222i-K9		18-port 4-Gbps Fibre	Yes	Yes	Auto, Shared
(Cisco MDS 9222i		Channel switch with
		4-Gigabit Ethernet IP
Multiservice
		storage services ports, and
Modular switch)
		a modular expansion slot to
		host Cisco MDS 9000
		Family Switching and
		Services Modules

1.Supports shared rate mode.

2.Shared rate mode is supported on Fx ports only and no ISLs.

3.All ports in a 48-port 4-Gbps switching module can operate in dedicated rate mode with a 1-Gbps operating speed. However, if you configure one or more ports to operate in 2-Gbps or 4-Gbps dedicated rate mode, some of the other ports in the port group would have to operate in shared mode.

4.All ports in a 24-port 4-Gbps switching module can operate in dedicated rate mode with a 2-Gbps operating speed. However, if you configure one or more ports to operate in 4-Gbps dedicated rate mode, some of the other ports in the port group would have to operate in shared mode.

Dedicated Rate Mode

When port rate mode is configured as dedicated, a port is allocated required fabric bandwidth and related resources to sustain line rate traffic at the maximum operating speed configured for the port. In this mode, ports do not use local buffering and all receive buffers are allocated from a global buffer pool (see the “Buffer Pools” section on page 4-2).

Table 3-4shows the bandwidth provided by the various port speed configurations on the 8-Gbps Advanced Fibre Channel switching modules.

Table 3-4 Bandwidth Reserved for the Port Speeds on Generation 4 Switching Modules

Configured Speed	Reserved Bandwidth
Auto	8 Gbps
8-Gbps
Auto with 4-Gbps maximum	4 Gbps
4-Gbps

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x		3-7