Configuring Port Speed - 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
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Use the following guidelines to configure 4-port 10-Gbps switching modules when starting with the
default configuration:
1.
2.

Configuring Port Speed

The port speed on an interface, combined with the rate mode, determines the amount of shared resources
available to the ports in the port group on a 48-port or 24-port 4-Gbps Fibre Channel switching module.
Especially in the case of dedicated rate mode, the port group resources are reserved even though the
bandwidth is not used. For example, if an interface is configured for autosensing (auto) and dedicated
rate mode, then 4 Gbps of bandwidth is reserved even though the maximum operating speed is 2 Gbps.
For the same interface, if autosensing with a maximum speed of 2 Gbps (auto max 2000) is configured,
then only 2 Gbps of bandwidth is reserved and the unused 2 Gbps is shared with the other interface in
the port group.
Caution Changing port speed and rate mode disrupts traffic on the port. Traffic on other ports in the port group
is not affected.
The 4-port 10-Gbps switching module supports 10-Gbps traffic only.
Note
To configure dedicated bandwidth on an interface using Fabric Manager, follow these steps
Step 1 Select a switch from the Fabric pane, or select a group of switches (SAN, fabric, VSAN) from the
Logical Domains pane.
Step 2 Expand Switches, expand Interfaces and select FC Physical from the Physical Attributes pane.
You see the FC Physical > General tab in the Interfaces pane.
Scroll until you see the row containing the switch and port you want to configure.
Step 3
Select auto, 1Gb, 4Gb, or autoMax2G from the Speed Admin column (see
Step 4
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Performance buffers
Configure the port mode.
See the "About Interface Modes" section on page
Configure the BB_credits, performance buffers, and extended BB_credits, as necessary.
See the "BB_Credit Buffers for Switching Modules" section on page
Fabric Switches" section on page
Configuring Generation 2 Module Interface Shared Resources
20-3.
22-14, and the "Extended BB_Credits" section on page
Cisco MDS 9000 Family CLI Configuration Guide
22-9, "BB_Credit Buffers for
22-15.
Figure 22-6).
22-21