You cant set the speed on any SFP full fibre port usually with fibre cable attached as it doesnt understand speed syntax , it would need to be changed to media rj45 with something like a GLC-T SFP for copper an then set as 10mb
If it has a fibre wire in it no you cant change it
so only if you use a copper based SFP for the uplink and then use a copper cable can you change the speed
Note
Only Catalyst 2960 switches have dual-purpose uplinks ports.
Some switches support dual-purpose uplink ports. By default, the switch dynamically selects the interface type that first links up. However, you can use the media-type interface configuration command to manually select the RJ-45 connector or the SFP module connector. For more information, see the “Dual-Purpose Uplink Ports” section.
Beginning in privileged EXEC mode, follow these steps to select which dual-purpose uplink to activate so that you can set the speed and duplex. This procedure is optional.
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Step 1
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configure terminal
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Enter global configuration mode.
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Step 2
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interface interface-id
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Specify the dual-purpose uplink port to be configured, and enter interface configuration mode.
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Step 3
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media-type { auto-select | rj45 | sfp }
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Select the interface and type of a dual-purpose uplink port. The keywords have these meanings:
- auto-select — The switch dynamically selects the type. When link up is achieved, the switch disables the other type until the active link goes down. When the active link goes down, the switch enables both types until one of them links up. In auto-select mode, the switch configures both types with autonegotiation of speed and duplex (the default). Depending on the type of installed SFP module, the switch might not be able to dynamically select it. For more information, see the information that follows this procedure.
- rj45 — The switch disables the SFP module interface. If you connect an SFP module to this port, it cannot attain a link even if the RJ-45 side is down or is not connected. In this mode, the dual-purpose port behaves like a 10/100/1000BASE-TX interface. You can configure the speed and duplex settings consistent with this interface type.
- sfp — The switch disables the RJ-45 interface. If you connect a cable to the RJ-45 port, it cannot attain a link even if the SFP module side is down or if the SFP module is not present. Based on the type of installed SFP module, you can configure the speed and duplex settings consistent with this interface type.
For information about setting the speed and duplex, see the “Speed and Duplex Configuration Guidelines” section.
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Step 4
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end
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Return to privileged EXEC mode.
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Step 5
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show interfaces interface-id transceiver properties
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Verify your setting.
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Step 6
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copy running-config startup-config
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(Optional) Save your entries in the configuration file.
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