Cisco SX SFP – How ‘Show Inventory’ Command Displays Information

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I've a Cisco 3925 and it's not quite clear why an "1000BASE-SX SFP" entry is visible in the inventory. Is it only visible when the SX SFP is in use? (I've no chance to modify it.)

NAME: "CISCO3925-CHASSIS", DESCR: "CISCO3925-CHASSIS"
PID: CISCO3925-CHASSIS , VID: V02

NAME: "Cisco Services Performance Engine 100 for Cisco 3900 ISR on Slot 0", DESCR: "Cisco Services Performance Engine 100 for Cisco 3900 ISR"
PID: C3900-SPE100/K9   , VID: V01

**NAME: "1000BASE-SX SFP", DESCR: "1000BASE-SX SFP"
PID: GLC-SX-MMD        , VID: 001**

NAME: "C3900 AC Power Supply 1", DESCR: "C3900 AC Power Supply 1"
PID: PWR-3900-AC       , VID: V02

Gi0/0   << RJ45
Gi0/1   << Combo port using RJ45
Gi0/2   << Combo port using SX

Best Answer

If you have an SFP module inserted, you will see the specific type.

You can choose to specifically use the inserted SFP, or choose to use the built-in copper connector, with the media-type interface command:

interface GigabitEthernet0/1
 media-type sfp

or

interface GigabitEthernet0/1
 media-type rj45
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