Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual page 487

Chapter 22 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
Figure 22-7
The minimum BB_credits required to bring up a port is two buffers.
Figure 22-7
The default BB_credit buffer allocation is the same for all port speeds.
Note
BB_Credit Buffers for Switching Modules
This section describes how buffer credits are allocated to Cisco MDS 9000 switching modules, and
includes the following topics:
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OL-17256-03, Cisco MDS NX-OS Release 4.x
shows the default BB_credit buffer allocation model for 24-port 4-Gbps switching modules.
BB_Credit Buffer Allocation in 24-port 4-Gbps Switching Modules
All ports
shared (4 Gpbs)
16 BB credits
1 Gbps
250 BB credits
48-Port 8-Gbps Fibre Channel Module BB_Credit Buffers, page 22-14
24-Port 8-Gbps Fibre Channel Module BB_Credit Buffers, page 22-15
4/44-Port 8-Gbps Host-Optimized Fibre Channel Module BB_Credit Buffers, page 22-16
48-Port 4-Gbps Fibre Channel Module BB_Credit Buffers, page 22-17
24-Port 4-Gbps Fibre Channel Module BB_Credit Buffers, page 22-18
18-Port Fibre Channel/4-Port Gigabit Ethernet Multiservice Module BB_Credit Buffers, page 22-19
4-Port 10-Gbps Switching Module BB_Credit Buffers, page 22-21
24-port module
Mixed
Dedicated
16 BB credits
2 Gbps
250 BB credits
Cisco MDS 9000 Family Fabric Manager Configuration Guide
Buffer Credit Allocation
All ports
dedicated (2 Gbps)
250 BB credits
Shared
4 Gbps
250 BB credits
22-13