4-21
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 4 Configuring Interface Buffers
Configuring Interface Buffers
Note If you use distance extension (buffer-to-buffer credit spoofing) on ISLs between switches, the BB_SCN
parameter on both sides of the ISL needs to be disabled.
Receive Data Field Size
You can also configure the receive data field size for Fibre Channel interfaces. If the default data field
size is 2112 bytes, the frame length will be 2148 bytes.
Configuring Interface Buffers
This section includes the following topics:
• Configuring Buffer-to-Buffer Credits, page 4-21
• Configuring Performance Buffers, page 4-22
• Configuring Extended BB_credits, page 4-23
• Enabling Buffer-to-Buffer Credit Recovery, page 4-24
• Enabling the Buffer-to-Buffer State Change Number, page 4-24
• Configuring Receive Data Field Size, page 4-24
Configuring Buffer-to-Buffer Credits
Detailed Steps
To configure BB_credits for a Fibre Channel interface, follow these steps:
Command Purpose
Step 1
switch# config t
switch(config)#
Enters configuration mode.
Step 2
switch(config)# interface fc1/1
switch(config-if)#
Selects a Fibre Channel interface and enters
interface configuration submode.
