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
14-21
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
Configuring Generation 2 Module Interface Shared Resources
Configuration Guidelines for 48-Port and 24-Port 4-Gbps Fibre Channel
Switching Modules
The 48-port and 24-port 4-Gbps Fibre Channel switching modules support the following features:
•
1-Gbps, 2-Gbps, and 4-Gbps speed traffic
•
Shared and dedicated rate mode
•
ISL (E or TE) and Fx (F or FL) port modes
•
Extended BB_credits
Migrating from Shared Mode to Dedicated Mode
To configure 48-port and 24-port 4-Gbps Fibre Channel switching modules when starting with the
default configuration or when migrating from shared rate mode to dedicated rate mode, follow these
guidelines:
1.
Take unused interfaces out of service to release resources for other interfaces, if necessary.
See the
“Taking Interfaces Out of Service” section on page 14-33
.
2.
Configure the traffic speed to use (1 Gbps, 2 Gbps, 4 Gbps, or autosensing with a maximum of
2 Gbps or 4 Gbps).
See the
“Configuring Port Speed” section on page 14-23
.
3.
Configure the rate mode (dedicated or shared) to use.
See the
“Configuring Rate Mode” section on page 14-24
.
4.
Configure the port mode.
See the
“About Interface Modes” section on page 12-3
.
Note
ISL ports cannot operate in shared rate mode.
5.
Configure the BB_credits and extended BB_credits, as necessary.
See the
“Extended BB_Credits” section on page 14-15
.
Migrating from Dedicated Mode to Shared Mode
To configure 48-port and 24-port 4-Gbps Fibre Channel switching modules migrating from dedicated
rate mode to shared rate mode, follow these guidelines:
1.
Take unused interfaces out of service to release resources for other interfaces, if necessary.
See the
“Taking Interfaces Out of Service” section on page 14-33
.
2.
Configure the BB_credits and extended BB_credits, as necessary.
See the
“BB_Credit Buffers for Switching Modules” section on page 14-9
,
“BB_Credit Buffers for
Fabric Switches” section on page 14-14
, and the
“Extended BB_Credits” section on page 14-15
.
3.
Configure the port mode.
See the
“About Interface Modes” section on page 12-3
.