Configuration Guidelines For 4-Port 10-Gbps Switching Module Interfaces; Configuring Port Speed - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 15 Configuring Generation 2 and Generation 3 Switching 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

Configuration Guidelines for 4-Port 10-Gbps Switching Module Interfaces

The 4-port 10-Gbps switching modules support the following features:
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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, 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 •
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Caution Changing port speed and rate mode disrupts traffic on the port. Traffic on other ports in the port group
is not affected.
OL-18084-01, Cisco MDS NX-OS Release 4.x
Only 10-Gbps speed traffic
Only dedicated rate mode
ISL (E or TE) and F port modes
Extended BB_credits
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
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.
Configuring Module Interface Shared Resources
13-3.
15-21, and the "Extended BB_Credits" section on page
Cisco MDS 9000 Family CLI Configuration Guide
15-11, "BB_Credit Buffers for
15-22.
15-33