Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual page 488

Buffer Credit Allocation
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
48-Port 8-Gbps Fibre Channel Module BB_Credit Buffers
Table 22-8
Table 22-8
BB_Credit Buffer Allocation
Default BB_credit buffers
Maximum BB_credit buffers
Total Number of BB_Credit Buffers per Module
Ports 1 through 24
Ports 25 through 48
The following guidelines apply to BB_credit buffers on 48-port 8-Gbps Fibre Channel switching
modules:
•
•
•
•
Each port group on the 48-port 8-Gbps Fibre Channel switching module consists of six ports. The ports
in shared rate mode in a port group can have a maximum bandwidth oversubscription of 10:1 considering
that each port group has 12.8-Gbps bandwidth.
The following example configurations are supported by the 48-port 8-Gbps Fibre Channel switching
modules:
•
•
•
•
•
Cisco MDS 9000 Family Fabric Manager Configuration Guide
22-14
lists the BB_credit buffer allocation for the 48-port 8-Gbps Fibre Channel switching module.
48-Port 8-Gbps Switching Module BB_Credit Buffer Allocation
BB_credit buffers allocated for ports 1 through 24 and 25 through 48 can be a maximum of 6000
each so that the load is distributed.
BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a
maximum of 500 buffers for dedicated rate mode.
BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and
the maximum of 500 buffers for dedicated rate mode or 32 buffers for shared rate mode.
Performance buffers are not supported on this module.
Six ports with shared rate mode and 8-Gbps speed (4:1 oversubscription) (default)
One port with dedicated rate mode and 8-Gbps speed plus
five ports with shared rate mode and 8-Gbps speed (10:1 oversubscription)
Two ports with dedicated rate mode and 4-Gbps speed plus
four ports with shared rate mode and 4-Gbps speed (4:1 oversubscription)
One port with dedicated rate mode and 4-Gbps speed plus
three ports with dedicated rate mode and 2-Gbps speed plus
two ports with shared rate mode and 4-Gbps speed (4:1 oversubscription)
Six ports with dedicated rate mode and 2-Gbps speed
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
BB_Credit Buffers Per Port
Dedicated Rate Mode
8-Gbps Speed
ISL Fx Port
250 32
500 500
6000
6000
OL-17256-03, Cisco MDS NX-OS Release 4.x
Shared Rate Mode
8-Gbps Speed
Fx Port
32
32