Bb_Credit Buffers For Switching Modules - Cisco MDS 9000 Series Configuration Manual

Buffer Pools
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 4-5
The minimum BB_credits required to bring up a port is two buffers.
Figure 4-5
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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Configuring Buffer Credits on a Generation 2 or Generation 3 Module
When you configure port mode to auto or E on a Generation 2 module, one of the ports will not come
up for the following configuration:
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When you configure port mode to auto or E on a Generation 3 module, one or two of the ports will not
come up for the following configuration:
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
4-6
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
Configuring Buffer Credits on a Generation 2 or Generation 3 Module, page 4-6
48-Port 8-Gbps Fibre Channel Module BB_Credit Buffers, page 4-7
24-Port 8-Gbps Fibre Channel Module BB_Credit Buffers, page 4-8
4/44-Port 8-Gbps Host-Optimized Fibre Channel Module BB_Credit Buffers, page 4-9
48-Port 4-Gbps Fibre Channel Module BB_Credit Buffers, page 4-10
24-Port 4-Gbps Fibre Channel Module BB_Credit Buffers, page 4-12
18-Port Fibre Channel/4-Port Gigabit Ethernet Multiservice Module BB_Credit Buffers, page 4-13
4-Port 10-Gbps Switching Module BB_Credit Buffers, page 4-15
Port Mode: auto or E for all of the ports
Rate Mode: dedicated
Buffer Credits: default value
24-port module
Mixed
Dedicated
16 BB credits
2 Gbps
250 BB credits
Chapter 4 Configuring Interface Buffers
All ports
dedicated (2 Gbps)
250 BB credits
Shared
4 Gbps
250 BB credits
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)