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The 1000BASE-T Small Form-Factor Pluggable (SFP) can support 10/100/1000 speeds only on the Cisco Catalyst 2970, 3560, and 3750 Series switches.
It is also possible to have the port auto-negotiate at a lower speed, or force a slower speed. Issue the show interface capabilities command in order to confirm whether a given GLC-T= supports 10/100 speed on a switch.
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