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20-13
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 20 Configuring Interfaces
Fibre Channel Interfaces
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.
Tip When migrating a host that supports up to 2-Gbps traffic (that is, not 4-Gbps with autosensing
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.
Note The port guard and port owner features are available for all ports irrespective of the operational mode.
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