Cisco Systems DSC9148D8G48PK9 manual BBCredit Buffers for Fabric Switches

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 4-10lists the BB_credit buffer allocation for 48-port 8-Gbps Fibre Channel switches.

Table 4-10	48-Port 8-Gbps Fabric Switch BB_Credit Buffer Allocation
		BB_Credit
		Buffers Per
BB_Credit Buffer Allocation Type		Port Group	BB_Credit Buffers Per Port
			ISL1	Fx Port
Default BB_credit buffers		128	32	32
Maximum configurable BB_credit buffers on 8-Gbps		128	125	125
mode

1. ISL = E port or TE port.

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 4-11lists the BB_credit buffer allocation for MDS 9134 Fabric Switches.

Table 4-11 MDS 9134 Fabric Switch BB_Credit Buffer Allocation

	BB_Credit
	Buffers Per
BB_Credit Buffer Allocation Type	Port Group	BB_Credit Buffers Per Port
		ISL1	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

1. ISL = E port or TE port.

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
4-16	OL-29284-01, Release 6.x