Port Rate Modes
In Generation 2, Generation 3, and Generation 4 modules, you can configure the port rate modes. The port rate mode configuration is used to determine the bandwidth allocation for ports in a port group. Two port rate modes are supported:
- Dedicated Rate Mode—A port is allocated required fabric bandwidth to sustain line traffic at the maximum operating speed configured on the port. For more information, see the "Dedicated Rate Mode" topic.
- Shared Rate Mode—Multiple ports in a port group share data paths to the switch fabric and share bandwidth. For more information, see the "Shared Rate Mode" topic.
Note In Generation 1 modules, you cannot configure the port rate modes. The mode is determined implicitly based on the port mode and line card type.
Note Port rate modes are not supported on the Cisco Fabric Switch for HP c-Class Blade System, and the Cisco Fabric Switch for IBM Blade Center.
Table 13-3 shows the modules that support dedicated, shared, and the default rate modes.
Part Number
Product Name/
Description
Supports Dedicated Rate Mode
Supports Shared Rate Mode
Default Speed Mode and Rate Mode on All Ports
Generation 4 Modules
DS-X9248-256K9
48-port 8-Gbps Advanced Fibre Channel switching module
Yes
Yes1
Auto, Shared
DS-X9232-256K9
32-port 8-Gbps Advanced Fibre Channel switching module
Yes
Yes1
Auto, Shared
Generation 3 Modules
DS-X9248-96K9
48-Port 8-Gbps Fibre Channel switching module
Yes
Yes2
Auto, Shared
DS-X9224-96K9
24-Port 8-Gbps Fibre Channel switching module
Yes
Yes2
Auto, Shared
DS-X9248-48K9
4/44-Port 8-Gbps Host-Optimized Fibre Channel switching module
Yes
Yes2
Auto Max 4 Gbps, Shared
Generation 3 Fabric Switches
DS-C9148-K9
(Cisco MDS 9148 Fabric switch)
48-port 8-Gbps Fabric switch
Yes
No
Auto, Dedicated
Generation 2 Modules
DS-X9148
48-port 4-Gbps Fibre Channel switching module 3
Yes
Yes
Auto, Shared
DS-X9124
24-port 4-Gbps Fibre Channel switching module
Yes
Yes
Auto, Shared
DS-X9304-18K9
(MSM-18/4 Multiservice module)
18-port 4-Gbps Fibre Channel switching module with 4-Gigabit Ethernet ports
Yes
Yes
Auto, Shared
DS-X9112
12-port 4-Gbps Fibre Channel switching module
Yes
No
Auto, Dedicated
DS-X9704
4-port 10-Gbps Fibre Channel switching module
Yes
No
Auto, Dedicated
Generation 2 Fabric Switches
DS-C9134-K9
(Cisco MDS 9134 Fabric switch)
32-port 4-Gbps Fabric switch
Yes
Yes
Auto, Shared
2-port 10-Gbps Fabric switch
Yes
No
Auto, Dedicated
DS-C9124-K9
(Cisco MDS 9124 Fabric switch)
24-port 4-Gbps Fabric switch4
Yes
No
Auto, Dedicated
DS-C9222i-K9
(Cisco MDS 9222i Multiservice Modular switch)
18-port 4-Gbps Fibre Channel switch with 4-Gigabit Ethernet IP storage services ports, and a modular expansion slot to host Cisco MDS 9000 Family Switching and Services Modules
Yes
Yes
Auto, Shared
1Supports shared rate mode.
2Shared rate mode is supported on Fx ports only and no ISLs.
3All 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.
4All 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.
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