Enabling Restrictions On Oversubscription Ratios; Configuring Bandwidth Fairness - 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
switch# copy running-config startup-config

Enabling Restrictions on Oversubscription Ratios

You must enable restrictions on oversubscription ratios before you can downgrade modules to a previous
Caution
release.
Before enabling restrictions on oversubscription ratios, ensure that you have explicitly configured shared
ports to out-of-service mode. To enable restrictions on oversubscription ratios on a 48-port or 24-port
4-Gbps, or any 8-Gbps Fibre Channel switching module, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface fc2/1-2,
fc2/4-5, fc2/8-38, fc2/43-48
Step 3
switch(config-if)# shutdown
Step 4
switch(config-if)# out-of-service
Step 5
switch# rate-mode oversubscription-limit
module 1
Step 6
switch# config t
switch(config)# interface fc2/1-2,
fc2/4-5, fc2/8-38, fc2/43-48
switch(config-if)# no out-of-service
switch(config-if)# no shutdown
Step 7
switch(config)# exit
Step 8
switch# copy running-config startup-config

Configuring Bandwidth Fairness

This feature improves fairness of bandwidth allocation among all ports and provides better throughput
average to individual data streams. Bandwidth fairness can be configured per module.
As of Cisco SAN-OS Release 3.1(2), all 48-port and 24-port 4-Gbps Fibre Channel switching modules,
as well as 18-port Fibre Channel/4-port Gigabit Ethernet Multiservice modules, have bandwidth fairness
enabled by default. As of Cisco NX-OS Release 4.1(1), all the 8-Gbps Fibre Channel switching modules
have bandwidth fairness enabled by default.
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)
Configuring Module Interface Shared Resources
Purpose
Enters configuration mode.
Specifies the port interfaces for which you want to
enable restrictions on oversubscription ratios.
Shuts down shared ports.
Takes shared ports out of service.
Enables restrictions on oversubscription ratios for
the module.
You must enter this command separately for
Note
each module for which you want to add the
restriction.
Returns all shared ports to service.
Exits configuration mode.
Saves the new oversubscription ratio configuration
to the startup configuration, and then the new
configuration is enforced upon subsequent reboots
of the module.
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
3-31