Cisco MDS 9000 Series Configuration Manual page 116

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 4-1
cards).
Figure 4-1
Figure 4-2
The minimum BB_credits required to bring up a port is two buffers.
Figure 4-2
250 BB credits
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
4-4
shows the allocation of BB_credit buffers on line cards (24-port and 48-port 4-Gbps line
Receive Buffers for Fibre Channel Ports in a Global Buffer Pool
Reserved Internal Buffers (not user configurable)
Performance Buffers (Shared Pool)
Common unallocated buffer pool for BB_credits
Allocated BB_credit buffers
1 2 3
for each front panel FC ports
shows the default BB_credit buffer allocation model for 48-port 8-Gbps switching modules.
BB_Credit Buffer Allocation in 48-Port 8-Gbps Switching Modules
All ports
shared (8 Gpbs)
32 BB credits
Dedicated
1 Gbps 2 Gbps
250 BB credits
48-port module
Mixed
Shared
32 BB credits
4 Gbps
250 BB credits
OL-19445-02, Cisco MDS NX-OS Release 4.2(x)
Chapter 4 Configuring Interface Buffers
N
All ports
dedicated (2 Gbps)
250 BB credits
8 Gbps
250 BB credits