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
Note
The extended BB_credit configuration takes precedence over the receive BB_credit and performance
buffer configurations.
Extended BB_credits on Generation 2 Switching Modules
To use this feature on Generation 2 switching modules, you must meet the following requirements:
•
Obtain the Enterprise package (ENTERPRISE_PKG) license (see
Chapter 3, “Obtaining and
Installing Licenses”
).
•
Configure this feature in any port on a Generation 2 switch module. See the
Extended BB_Credits,
page 14-15
for more information on extended BB_credits on Generation 2 switching modules.
Note
Extended BB_credits are not supported on the Cisco MDS 9124 Fabric Switch.
Configuring Extended BB_credits
To configure extended BB_credits for a MDS-14/2 interface, for a Generation 2 switching module
interface (not including the Cisco MDS 9124 Fabric Switch), or for an interface in a Cisco MDS 9216i
switch, follow these steps:
Command
Purpose
Step 1
switch#
config t
switch(config)#
Enters configuration mode.
Step 2
switch(config)#
fcrxbbcredit extended enable
Enables the extended BB_credits feature.
switch(config)#
no fcrxbbcredit extended
enable
Disables (default) the extended BB_credits
feature.
Step 3
switch(config)#
interface
fc1/1
switch(config-if)#
Selects a Fibre Channel interface and enters
interface configuration submode.
Step 4
switch(config-if)#
switchport fcrxbbcredit
extended 1500
Applies the extended BB_credit value of 1,500
credits to the selected interface. The valid range is
from 256 to 3,500 credits.
switch(config-if)#
no
switchport
fcrxbbcredit extended 1500
Clears the configured extended BB_credit
configuration for this port.
Step 5
switch#
do show interface fc3/2
fc3/2 is trunking
Hardware is Fibre Channel, SFP is short wave
laser w/o OFC (SN)
Port WWN is 20:82:00:05:30:00:2a:1e
Peer port WWN is 20:42:00:0b:46:79:f1:80
Admin port mode is auto, trunk mode is
on
Port mode is TE
Port vsan is 1
Speed is 2 Gbps
Transmit B2B Credit is 255
Receive B2B Credit is 1500
Receive data field Size is 2112
...
Displays the receive and transmit BB_credit
values along with other pertinent interface
information for this interface if the interface is in
the up state.
Note
The receive BB_credit value reflects the
extended BB_credit configuration, if
applicable.