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
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Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 12 Configuring Interfaces
Buffer Credits
About Performance Buffers
Note
Performance buffers are not supported on the Cisco MDS 9124 Fabric Switch, the Cisco Fabric Switch
for HP c-Class BladeSystem, and the Cisco Fabric Switch for IBM BladeCeter.
Regardless of the configured receive BB_credit value, additional buffers, called performance buffers,
improve switch port performance. Instead of relying on the built-in switch algorithm, you can manually
configure the performance buffer value for specific applications (for example, forwarding frames over
FCIP interfaces).
For each physical Fibre Channel interface in any switch in the Cisco MDS 9000 Family, you can specify
the amount of performance buffers allocated in addition to the configured receive BB_credit value.
The default performance buffer value is 0. If you use the
default
option, the built-in algorithm is used.
If you do not specify this command, the
default
option is automatically used.
Configuring Performance Buffers
To configure performance buffers for a Fibre Channel interface, follow these steps:
Note
Use the
show interface bbcredit
command to display performance buffer values and other BB_credit
information.
About Extended BB_credits
You can use the extended BB_credits flow control mechanism in addition to BB_credits for long haul
links.
This section includes the following topics:
•
Extended BB_credits on Generation 1 Switching Modules, page 12-35
•
Extended BB_credits on Generation 2 Switching Modules, page 12-36
Command
Purpose
Step 1
switch#
config t
Enters configuration mode.
Step 2
switch(config)#
interface
fc1/1
switch(config-if)#
Selects a Fibre Channel interface and enters interface
configuration submode.
Step 3
switch(config-if)#
switchport
fcrxbbcredit performance-buffers 45
Assigns a performance buffer of 45 to the selected
interface. The value ranges from 1 to 145.
switch(config-if)#
switchport
fcrxbbcredit performance-buffers default
Reverts to the factory default of using the built-in
algorithm.
Содержание 9124 - Cisco MDS Fabric Switch
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