Dedicated Rate Mode - Cisco MDS 9000 Series Configuration Manual

Port Groups and Port Rate Modes
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
2. All ports in a 48-port 4-Gbps switching module can operate in dedicated rate mode with a 1-Gbps operating speed. However,
3. All ports in a 24-port 4-Gbps switching module can operate in dedicated rate mode with a 2-Gbps operating speed. However,

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
Table 3-4
Channel switching modules.
Table 3-4
Configured Speed
Auto
8-Gbps
Auto with 4-Gbps maximum
4-Gbps
Auto with 2-Gbps maximum
2-Gbps
1-Gbps
Table 3-5
modules.
Table 3-5
Configured Speed
Auto
4-Gbps
Auto with 2-Gbps maximum
2-Gbps
1-Gbps
Note The 4-Port 10-Gbps Fibre Channel module ports in auto mode only support auto speed mode at 10 Gbps.
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
3-6
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.
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
"Buffer Pools" section on page
shows the bandwidth provided by the various port speed configurations on the 8-Gbps Fibre
Bandwidth Reserved for the Port Speeds on Generation 3 Switching Modules
show the amount of bandwidth reserved for a configured port speed on 4-Gbps switching
Bandwidth Reserved for the Port Speeds on Generation 2 Switching Modules
4-3).
Reserved Bandwidth
8 Gbps
4 Gbps
2 Gbps
1 Gbps
Reserved Bandwidth
4 Gbps
2 Gbps
1 Gbps
Chapter 3 Configuring Fibre Channel Interfaces
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)