Bb_Credit Buffers For Fabric Switches; Cisco Mds 9134 Fabric Switch Bb_Credit Buffers - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

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
The ports in the 4-port 10-Gbps switching module only support 10-Gbps dedicated rate mode. FL port
Note
mode and shared rate mode are not supported.
The following considerations apply to BB_credit buffers on 4-port 10-Gbps switching modules:
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Note

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:
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Cisco MDS 9134 Fabric Switch BB_Credit Buffers

Table 14-10
Table 14-10
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 on 32-port 4-Gbps switches:
•
•
Cisco MDS 9000 Family CLI Configuration Guide
14-14
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)).
Extended BB_credits are allocated across all ports on the switch. That is, they are not allocated
by port group.
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
lists the BB_credit buffer allocation for 32-port 4-Gbps Fibre Channel switches.
32-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
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.
Chapter 14 Configuring Generation 2 Switches and Modules
BB_Credit
Buffers Per BB_Credit Buffers Per Port
Port Group Defaults
1
ISL
64 64
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Fx Port
64