Port 10-Gbps Switching Module Bb_Credit Buffers - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Chapter 22 Configuring Generation 2 Switches and 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
The following considerations apply to BB_credit buffers on 12-port 4-Gbps switching modules:
•
•
•
•
Note
By default, the ports in the 12-port 4-Gbps switching modules come up in 4-Gbps dedicated rate mode
Note
but can be configured as 1-Gbps and 2-Gbps dedicated rate mode. Shared mode is not supported.

4-Port 10-Gbps Switching Module BB_Credit Buffers

Table 22-9
Table 22-9
BB_Credit Buffer Allocation Type
User configurable BB_credit buffers
Performance buffers
1. ISL = E port or TE port.
2. Ports on the 4-port 10-Gbps cannot operate in FL port mode.
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:
•
•
•
OL-16184-01, Cisco MDS SAN-OS Release 3.x
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 2488 extra buffers available as extended BB_credit buffers after allocating all the default
BB_credit buffers for all the ports in ISL mode (5488 - (250 * 12)).
Extended BB_credits are allocated across all ports on the switch. That is, they are not allocated
by port group.
lists the BB_credit buffer allocation for 4-port 10-Gbps switching modules.
4-port 10-Gbps Switching 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.
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.
BB_Credit Buffers Per Port Defaults
Dedicated Rate Mode
4-Gbps Speed
BB_Credit Buffers
1
Per Module ISL
5488 250
512 (shared) 145
Cisco MDS 9000 Family CLI Configuration Guide
Buffer Credit Allocation
2
F port
16
12
22-13