Cisco Systems DSC9148D8G48PK9 manual Shared Rate Mode, Auto Gbps Auto with 2-Gbps maximum

Chapter 3 Configuring Fibre Channel Interfaces

Information About Fibre Channel Interfaces

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

Configured Speed	Reserved Bandwidth
Auto with 2-Gbps maximum	2 Gbps
2-Gbps
1-Gbps	1 Gbps

Table 3-5shows the bandwidth provided by the various port speed configurations on the 8-Gbps Fibre Channel switching modules.

Table 3-5 Bandwidth Reserved for the Port Speeds on Generation 3 Switching Modules

Configured Speed	Reserved Bandwidth
Auto	8 Gbps
8-Gbps
Auto with 4-Gbps maximum	4 Gbps
4-Gbps
Auto with 2-Gbps maximum	2 Gbps
2-Gbps
1-Gbps	1 Gbps

Table 3-6shows the amount of bandwidth reserved for a configured port speed on 4-Gbps switching modules.

Table 3-6 Bandwidth Reserved for the Port Speeds on Generation 2 Switching Modules

Configured Speed	Reserved Bandwidth
Auto	4 Gbps
4-Gbps
Auto with 2-Gbps maximum	2 Gbps
2-Gbps
1-Gbps	1 Gbps

Note The 4-Port 10-Gbps Fibre Channel module ports in auto mode only support auto speed mode at 10 Gbps.

Shared Rate Mode

When port rate mode is configured as shared, multiple ports within a port group share data paths to the switch fabric so that fabric bandwidth and related resources are shared. Often, the available bandwidth to the switch fabric may be less than the negotiated operating speed of a port. Ports in this mode use local buffering for the BB_credit buffers.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
3-8	OL-29284-01, Release 6.x