Switch User Manual

4-4
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 4 Configuring Interface Buffers
Information About Interface Buffers
Figure 4-3 shows the default BB_credit buffer allocation model for 24-port 8-Gbps switching modules.
The minimum BB_credits required to bring up a port is two buffers.
Figure 4-3 BB_Credit Buffer Allocation in 24-Port 8-Gbps Switching Modules
Figure 4-4 shows the default BB_credit buffer allocation model for 4/44-port 8-Gbps host-optimized
switching modules. The minimum BB_credits required to bring up a port is two buffers.
Figure 4-4 BB_Credit Buffer Allocation in 4/44-Port 8-Gbps Switching Modules
24-port module
Mixed
All ports
shared (8 Gpbs)
32 BB credits
1 Gbps
500 BB credits
2 Gbps
500 BB credits
4 Gbps
500 BB credits
All ports
dedicated (2 Gbps)
500 BB credits
Dedicated
Shared
32 BB credits
8 Gbps
500 BB credits
189047
4/44-port module
Mixed
All ports
shared (8 Gpbs)
32 BB credits
1 Gbps
250 BB credits
2 Gbps
250 BB credits
4 Gbps
250 BB credits
All ports
dedicated (2 Gbps)
125 BB credits
Dedicated
Shared
32 BB credits
8 Gbps
125 BB credits
189049