Dynamic Bandwidth Management - Cisco MDS 9000 Series Configuration Manual

Chapter 3 Configuring Fibre Channel Interfaces
S e 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 c k - d o c @ c i s c o . c o m
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.
All ports in 4-Gbps Fibre Channel switching modules where bandwidth is shared support 1-Gbps,
2-Gbps, or 4-Gbps traffic. However, it is possible to configure one or more ports in a port group to
operate in dedicated rate mode with 1-Gbps, 2-Gbps or 4-Gbps operating speed.
All ports in the 48-Port and 24-Port 8-Gbps Fibre Channel switching modules where bandwidth is shared
support 1-Gbps, 2-Gbps, 4-Gbps, or 8-Gbps traffic.
In the 4/44-Port 8-Gbps Host-Optimized Fibre Channel switching module, all the ports where bandwidth
is shared support 1-Gbps, 2-Gbps, 4-Gbps in a maximum of 44 ports, or 8 Gbps in a maximum of 4 ports.
Dedicated Rate Mode Configurations for the 8-Gbps Modules
Table 3-2
3 Fibre Channel modules.
Table 3-6
Part Number
DS-X9248-96K9
DS-X9224-96K9
DS-X9248-48K9

Dynamic Bandwidth Management

On port switching modules where bandwidth is shared, the bandwidth available to each port within a port
group can be configured based on the port rate mode and speed configurations. Within a port group, some
ports can be configured in dedicated rate mode while others operate in shared mode.
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)
shows the maximum possible dedicated rate mode configuration scenarios for the Generation
Dedicated Rate Mode Bandwidth Reservation for Generation 3 Fibre Channel
Modules
Product Name/
Description
48-port 8-Gbps
Fibre Channel
switching module
24-port 8-Gbps
Fibre Channel
switching module
4/44-port 8-Gbps
Host-Optimized
Fibre Channel
switching module
Dedicated Maximum
Bandwidth Allowed Ports
per Port that can come up Ports in Shared Mode
8 Gbps 8 Ports
4 Gbps 24 Ports
2 Gbps 48 Ports
8 Gbps 8 Ports
4 Gbps 24 Ports
8 Gbps 4 Ports
4 Gbps 12 Ports
2 Gbps 24 Ports
1 Gbps 48 Ports
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
Port Groups and Port Rate Modes
All the remaining ports
are 8 Gbps shared.
All the remaining ports
are 8 Gbps shared.
All the remaining ports
are 4 Gbps shared (8 Gbps
of bandwidth can be
provided only to one port
per port group in
Dedicated or Shared rate
mode).
3-7