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22-29
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
Configuring Module Interface Shared Resources
• Shared and dedicated rate mode
• ISL and Fx port modes
• Extended BB_credits
Migrating from Shared Mode to Dedicated Mode
To configure 48-port, 24-port, 4/44-port 8-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 22-40.
2. Configure the traffic speed to use (1 Gbps, 2 Gbps, 4 Gbps, 8 Gbps, or autosensing with a maximum
of 2 Gbps or 4 Gbps).
See the “Configuring Port Speed” section on page 22-32.
3. Configure the rate mode (dedicated or shared).
See the “Configuring Rate Mode” section on page 22-33.
4. Configure the port mode.
See the “About Interface Modes” section on page 20-3.
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 22-23.
Migrating from Dedicated Mode to Shared Mode
To configure 48-port, 24-port, 4/44-port 8-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 22-40.
2. Configure the BB_credits and extended BB_credits, as necessary.
See the “BB_Credit Buffers for Switching Modules” section on page 22-13, “BB_Credit Buffers for
Fabric Switches” section on page 22-22, and the “Extended BB_Credits” section on page 22-23.
3. Configure the port mode.
See the “About Interface Modes” section on page 20-3.
Note ISL ports cannot operate in shared rate mode.
4. Configure the rate mode (dedicated or shared) to use.
See the “Configuring Rate Mode” section on page 22-33.
5. Configure the traffic speed (1 Gbps, 2 Gbps, 4 Gbps, 8 Gbps, or autosensing with a maximum of 2
Gbps or 4 Gbps) to use.
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