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22-13
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
Buffer Credit Allocation
Figure 22-7 shows the default BB_credit buffer allocation model for 24-port 4-Gbps switching modules.
The minimum BB_credits required to bring up a port is two buffers.
Figure 22-7 BB_Credit Buffer Allocation in 24-port 4-Gbps Switching Modules
Note The default BB_credit buffer allocation is the same for all port speeds.
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:
• 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
All ports
shared (4 Gpbs)
16 BB credits
1 Gbps
250 BB credits
2 Gbps
250 BB credits
4 Gbps
250 BB credits
All ports
dedicated (2 Gbps)
250 BB credits
Dedicated
Shared
16 BB credits
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