Configuring Port Speed - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 14 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
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.
Changing port speed and rate mode disrupts traffic on the port. Traffic on other ports in the port group
Caution
is not affected.
The 4-port 10-Gbps switching module supports 10-Gbps traffic only.
Note
To configure the port speed on an interface on a 4-Gbps switching module, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# interface fc 1/1
switch(config-if)#
Step 3
switch(config-if)# switchport speed 4000
switch(config-if)# switchport speed auto
switch(config-if)# switchport speed auto max
2000
switch(config-if)# no switchport speed
Use the show interface command to verify the port speed configuration for an interface on a 24-port or
48-port 4-Gbps Fibre Channel switching module.
switch# show interface fc 9/1
OL-16184-01, Cisco MDS SAN-OS Release 3.x
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
12-3.
14-14, and the "Extended BB_Credits" section on page
Purpose
Enters configuration mode.
Selects the interface and enters interface
configuration submode.
Configures the port speed in megabits per
second. Valid values are 1000, 2000, 4000 and
auto. The auto parameter enables autosensing
on the interface.
Configures autosensing for the interface with
4 Gbps of bandwidth reserved.
Configures autosensing with a maximum of
2 Gbps of bandwidth reserved.
Reverts to the default speed for the interface
(auto).
Cisco MDS 9000 Family CLI Configuration Guide
14-9, "BB_Credit Buffers for
14-15.
14-23