Buffer Pools - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 15 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
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Buffer Pools

In the architecture of Generation 2 and Generation 3 modules, receive buffers shared by a set of ports
are called buffer groups. The receive buffer groups are organized into global and local buffer pools.
The receive buffers allocated from the global buffer pool to be shared by a port group are called a global
recieve buffer pool. Global receive buffer pools include the following buffer groups:
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The 48-Port and 24-Port 8-Gbps modules have dual global buffer pools. Each buffer pool in the 48-port
Note
modules support 24 ports and in the 24-port modules each buffer pool supports 12 ports.
Figure 15-1
cards).
Figure 15-1
OL-18084-01, Cisco MDS NX-OS Release 4.x
Extended BB_Credits, page 15-22
Reserved internal buffers
Allocated BB_credit buffers for each Fibre Channel interface (user configured or assigned by
default)
Common unallocated buffer pool for BB_credits, if any, to be used for additional BB_credits as
needed
Performance buffers (only used on 12-port 4-Gbps and 4-port 10-Gbps switching modules)
shows the allocation of BB_credit buffers on linecards (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
1 2 3
Allocated BB_credit buffers
for each front panel FC ports
Cisco MDS 9000 Family CLI Configuration Guide
Buffer Credit Allocation
N
15-9