Autosensing; Specifying A Port Owner - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 13 Configuring Interfaces
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
For internal ports on the Cisco Fabric Switch for HP c_Class BladeSystem and Cisco Fabric Switch for
IBM BladeCenter, a port speed of 1 Gbps is not supported. Auto-negotiation is supported between 2
Gbps and 4 Gbps only. Also, if the BladeCenter is a T chassis, then port speeds are fixed at 2 Gbps and
auto-negotiation is not enabled.

Autosensing

Autosensing speed is enabled on all 4-Gbps and 8-Gbps switching module interfaces by default. This
configuration enables the interfaces to operate at speeds of 1 Gbps, 2 Gbps, or 4 Gbps on the 4-Gbps
switching modules, and 8-Gbps on the 8-Gbps switching modules. When autosensing is enabled for an
interface operating in dedicated rate mode, 4-Gbps of bandwidth is reserved, even if the port negotiates
at an operating speed of 1-Gbps or 2-Gbps.
To avoid wasting unused bandwidth on 48-port and 24-port 4-Gbps and 8-Gbps Fibre Channel switching
modules, you can specify that only 2 Gbps of required bandwidth be reserved, not the default of 4 Gbps
or 8-Gbps. This feature shares the unused bandwidth within the port group provided that it does not
exceed the rate limit configuration for the port. You can also use this feature for shared rate ports that
are configured for autosensing.
When migrating a host that supports up to 2-Gbps traffic (that is, not 4-Gbps with autosensing
Tip
capabilities) to the 4-Gbps switching modules, use autosensing with a maximum bandwidth of 2-Gbps.
When migrating a host that supports up to 4-Gbps traffic (that is, not 8-Gbps with autosensing
capabilities) to the 8-Gbps switching modules, use autosensing with a maximum bandwidth of 4-Gbps.

Specifying a Port Owner

Using the port owner feature, you can specify the owner of a port and the purpose for which a port is
used so that the other administrators are informed.
To specify or remove the port owner, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# interface fc1/1
Step 3
switch(config)# switchport owner description
switch(config)# no switchport owner
The port guard and port owner features are available for all ports irrespective of the operational mode.
Note
To display the owner description specified for a port, use the following commands:
switch# show running interface fc module-number/interface-number
switch# show port internal info interface fc module-number/interface-number
OL-18084-01, Cisco MDS NX-OS Release 4.x
Purpose
Enters configuration mode.
Selects the port interface.
The description can include name of the owner
and the purpose for which the port is used. The
description can be up to 80 characters long.
Removes (default) the port owner description.
Cisco MDS 9000 Family CLI Configuration Guide
Fibre Channel Interfaces
13-15