Enabling The Buffer-To-Buffer State Change Number - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual
Cisco mds 9000 family cli configuration guide - release 4.x (ol-18084-01, february 2009)
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Table of Contents
Chapter 15
Configuring Generation 2 and Generation 3 Switching Modules
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
To release the shared resources for a port group, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface fc 1/1
switch(config-if)#
Step 3
switch(config-if)# no channel-group
Step 4
switch(config-if)# shutdown
Step 5
switch(config-if)# out-of-service
Putting an interface into out-of-service will
cause its shared resource configuration to
revert to default
Do you wish to continue(y/n)? [n] y
Step 6
switch(config-if)# no out-of-service
Enabling the Buffer-to-Buffer State Change Number
The BB_SC_N field (word 1, bits 15-12) specifies the buffer-to-buffer state change (BB_SC) number.
The BB_SC_N field indicates that the sender of the port login (PLOGI), fabric login (FLOGI), or ISLs
(E or TE ports) frame is requesting 2^SC_BB_N number of frames to be sent between two consecutive
BB_SC send primitives, and twice the number of R_RDY primitives to be sent between two consecutive
BB_SC receive primitives.
For Generation 2 and Generation 3 modules, the BB_SCN on ISLs (E or TE ports) is enabled by default.
This can fail the ISLs if used with the optical equipments using Distance Extension (DE), also known as
buffer-to-buffer credit spoofing.
If you use Distance Extension, or buffer-to-buffer credit spoofing on ISLs between switches, the
Note
BB_SCN paramater on both sides of the ISL needs to be disabled.
To use the BB_SC_N field during PLOGI or FLOGI, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface fc 1/1
switch(config-if)#
Step 3
switch(config-if)# switchport fcbbscn
switch(config-if)# no switchport fcbbscn
OL-18084-01, Cisco MDS NX-OS Release 4.x
Configuring Module Interface Shared Resources
Purpose
Enters configuration mode.
Selects the interface and enters interface
configuration submode.
You can use an interface range to
Tip
release the resources for all interfaces
in a port group.
Removes the interface from a PortChannel.
Disables the interface.
Takes the interface out of service.
Makes the interface available for service.
Repeat
Step 2
through
interfaces in the port group.
Purpose
Enters configuration mode.
Selects the interface and enters interface
configuration submode.
Enables the use of buffer-to-buffer state change
number for PLOGIs and FLOGIs on the interface.
Disables (default) the use of buffer-to-buffer state
change number for PLOGIs and FLOGIs on the
interface.
Cisco MDS 9000 Family CLI Configuration Guide
Step 6
for all the
15-49
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