Configuring Port Speed - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Configuring Module Interface Shared Resources
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
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, 24-port 4-Gbps, or any 8-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, on Generation 2 modules, 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.
Note •
•
•
Changing port speed and rate mode disrupts traffic on the port. Traffic on other ports in the port group
Caution
is not affected.
To configure dedicated bandwidth on an interface using Fabric Manager, follow these steps:
Select a switch from the Fabric pane, or select a group of switches (SAN, fabric, VSAN) from the
Step 1
Logical Domains pane.
Expand Switches, expand Interfaces and select FC Physical from the Physical Attributes pane.
Step 2
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
Note
Cisco MDS 9000 Family Fabric Manager Configuration Guide
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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
The Generation 2, 4-port 10-Gbps switching module supports 10-Gbps traffic only.
On Generation 3, 8-Gbps modules, setting the port speed to auto enables autosensing, which
negotiates to a maximum speed of 8 Gbps.
On Generation 2, 4-Gbps modules, setting the port speed to auto enables autosensing, which
negotiates to a maximum speed of 4 Gbps.
The Generation 3, 8-Gbps Fibre Channel swtiching modules support the following speed
configurations: 1G, 2G, 4G, 8G, autoMax2G, autoMax4G and the auto speed configuration
configures autosensing for the interface with 8 Gbps of bandwidth reserved.
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
20-3.
22-22, and the "Extended BB_Credits" section on page
22-13, "BB_Credit Buffers for
Figure 22-11).
OL-17256-03, Cisco MDS NX-OS Release 4.x
22-23.