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
14-14
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 14 Configuring Generation 2 Switches and Modules
Buffer Credit Allocation
Note
The ports in the 4-port 10-Gbps switching module only support 10-Gbps dedicated rate mode. FL port
mode and shared rate mode are not supported.
The following considerations apply to BB_credit buffers on 4-port 10-Gbps switching modules:
•
BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a
maximum of 250 buffers.
•
BB_credit buffers for Fx port mode connections can be configured from a minimum of 2 buffers to
a maximum of 250 buffers.
•
By default, 512 performance buffers are preallocated and are shared by all the ports. These buffers
are configurable and the buffers are assigned to the port based on the availability of the buffers in
the shared pool.
•
There are 4488 extra buffers available as extended BB_credits after allocating all the default
BB_credit buffers for all the ports in ISL mode (5488 - (250 * 4)).
Note
Extended BB_credits are allocated across all ports on the switch. That is, they are not allocated
by port group.
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 9134 Fabric Switch BB_Credit Buffers
•
Cisco MDS 9124 Fabric Switch BB_Credit Buffers, page 14-15
•
Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers, page 14-15
Cisco MDS 9134 Fabric Switch BB_Credit Buffers
Table 14-10
lists the BB_credit buffer allocation for 32-port 4-Gbps Fibre Channel switches.
The following considerations apply to BB_credit buffers on 32-port 4-Gbps switches:
•
BB_credit buffers for connections can be configured from a minimum of 2 buffers to a maximum of
250 buffers per port.
•
BB_credit buffers for Fx port mode connections can be configured from a minimum of 2 buffers to
a maximum of 250 buffers.
Table 14-10
32-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
BB_Credit Buffer Allocation Type
BB_Credit
Buffers Per
Port Group
BB_Credit Buffers Per Port
Defaults
ISL
1
1.
ISL = E port or TE port.
Fx Port
User configurable BB_credit buffers
64
64
64