Buffer Credit Allocation
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
For an example of the configuration of the this example, see the
Channel Switching Module Example" section on page
18-Port Fibre Channel/4-Port GigabitEthernet Multiservice Module BB_Credit Buffers
BB_Credit Buffer Allocation Type
User configurable BB_credit buffers
1. ISL = E port or TE port.
The following considerations apply to BB_credit buffers on18-port 4-Gbps Fibre Channel switching
12-Port 4-Gbps Switching Module BB_Credit Buffers
Cisco MDS 9000 Family CLI Configuration Guide
Two ports with dedicated rate mode and 4-Gbps speed plus
four ports with shared rate mode and 4-Gbps speed (with 4:1 oversubscription)
One port with dedicated rate mode and 4-Gbps speed plus
three ports with dedicated rate mode and 2-Gbps speed plus
two ports with shared rate mode and 4-Gbps speed (4:1 oversubscription)
Six ports with dedicated rate mode and 2-Gbps speed
Three ports with dedicated rate mode and 4-Gbps speed plus
three ports with shared rate mode and 1-Gbps speed (see
Example Speed and Rate Configuration on a 24-Port 4-Gbps Switching Module
lists the BB_credit buffer allocation for 18-port 4-Gbps multiservice modules.
18-Port 4-Gbps Multiservice Module BB_Credit Buffer Allocation Defaults
BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a
maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and
the maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
Performance buffers are not supported on this module.
lists the BB_credit buffer allocation for 12-port 4-Gbps switching modules.
BB_Credit Buffers Per Port Defaults
Dedicated Rate Mode
Configuring Generation 2 Switches and Modules
"Configuring a 24-port 4-Gbps Fibre
Shared Rate Mode
OL-16184-01, Cisco MDS SAN-OS Release 3.x