4-16
Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 4 Configuring Interface Buffers
Information About Interface Buffers
BB_Credit Buffers for Fabric Switches
This section describes how buffer credits are allocated to Cisco MDS 9000 Fabric switches, and includes
the following topics:
• Cisco MDS 9148 Fabric Switch BB_Credit Buffers, page 4-16
• Cisco MDS 9148 Fabric Switch BB_Credit Buffers, page 4-16
• Cisco MDS 9124 Fabric Switch BB_Credit Buffers, page 4-17
• Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers, page 4-17
Cisco MDS 9148 Fabric Switch BB_Credit Buffers
Table 4-10 lists the BB_credit buffer allocation for 48-port 8-Gbps Fibre Channel switches.
The following considerations apply to BB_credit buffers on 48-port 8-Gbps Fabric Switches:
• BB_credit buffers can be configured from a minimum of 1 buffer to a maximum of 32 buffers per
port when the ports are in F or FL mode.
• BB_credit buffers can be configured from a minimum of 2 buffers to a maximum of 32 buffers per
port when the ports are in E or TE mode.
Cisco MDS 9134 Fabric Switch BB_Credit Buffers
Table 4-11 lists the BB_credit buffer allocation for MDS 9134 Fabric Switches.
Ta b l e 4-10 48-Port 8-Gbps Fabric Switch BB_Credit Buffer Allocation
BB_Credit Buffer Allocation Type
BB_Credit
Buffers Per
Port Group
BB_Credit Buffers Per Port
ISL
1
1. ISL = E port or TE port.
Fx Port
Default BB_credit buffers 128 32 32
Maximum configurable BB_credit buffers on 8-Gbps
mode
128 125 125
Ta b l e 4-11 MDS 9134 Fabric Switch BB_Credit Buffer Allocation
BB_Credit Buffer Allocation Type
BB_Credit
Buffers Per
Port Group
BB_Credit Buffers Per Port
ISL
1
1. ISL = E port or TE port.
Fx Port
Maximum user-configurable BB_credit buffers 64 61 61
Minimum user-configurable BB_credit buffers 2 1
Default BB_credit buffers on 10-Gbps mode 64 64 64
Default BB_credit buffers on 4-Gbps mode 64 16 16
