Extended Bb_Credits On Generation 2 Switching Modules; Configuring Extended Bb_Credits - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Buffer Credits
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
The extended BB_credit configuration takes precedence over the receive BB_credit and performance
Note
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:
•
•
Extended BB_credits are not supported on the Cisco MDS 9124 Fabric Switch.
Note

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
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# fcrxbbcredit extended enable
switch(config)# no fcrxbbcredit extended
enable
Step 3
switch(config)# interface fc1/1
switch(config-if)#
Step 4
switch(config-if)# switchport fcrxbbcredit
extended 1500
switch(config-if)# no switchport
fcrxbbcredit extended 1500
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)
on
Cisco MDS 9000 Family CLI Configuration Guide
12-36
Obtain the Enterprise package (ENTERPRISE_PKG) license (see
Installing Licenses").
Configure this feature in any port on a Generation 2 switch module. See the
page 14-15 for more information on extended BB_credits on Generation 2 switching modules.
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
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
...
Chapter 12
Chapter 3, "Obtaining and
Purpose
Enters configuration mode.
Enables the extended BB_credits feature.
Disables (default) the extended BB_credits
feature.
Selects a Fibre Channel interface and enters
interface configuration submode.
Applies the extended BB_credit value of 1,500
credits to the selected interface. The valid range is
from 256 to 3,500 credits.
Clears the configured extended BB_credit
configuration for this port.
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.
The receive BB_credit value reflects the
Note
extended BB_credit configuration, if
applicable.
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Configuring Interfaces
Extended BB_Credits,