Does 3750-12S GigE Port Support 10/100/1000Gbps or just 1000Gbps

Answered Question
Nov 25th, 2009

Hi

Just want to confirm is the 3750-12S GigE Port support variable speed or is it fixed 1GigE only.

Thanks

Bill

I have this problem too.
0 votes
Correct Answer by Leo Laohoo about 7 years 1 month ago

Only the GLC-TX will support 10/100/100.  If you want the SFP to support 100mbps (only) then you need to look at the following link: 

Cisco 100BASE-FX SFP Fast Ethernet Interface Converter on Gigabit SFP Ports
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6578/product_data_sheet0900aecd801ba88e_ps5000_Products_Data_Sheet.html

The Cisco 100BASE-FX SFP on Gigabit SFP ports is supported on Cisco Catalyst 3750, 3560, and 2970 series switches.

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Jon Marshall Wed, 11/25/2009 - 14:15

Bill

Short answer is yes. Have a look at the Q&A for the 3750, the "Technology Overview" section, about 1/3 of the way down -

3750 Q&A

Jon

billsayegh Wed, 11/25/2009 - 15:00

Thanks Jon

I checked the Q&A and it does not specifically state that the 3750-12S supports 10/100/1000.

What I could find is:

WS-C3750G-12S-E

• 12 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed provides full dynamic IP routing

Is the below refering to the 3750-S SFP ports, by stating the SFP port it is implicit that all SFP support 10/100/100?

Can the 1000BASE-T SFP support 10/100/1000 speeds?

A. Yes, the 1000BASE-T SFP can support 10/100/1000 speeds on the Cisco Catalyst 3750 Series Switches. Please refer to the 1000BASET-T SFP Compatibility Matrix for information about support on other Cisco products.
Regards
Bill
Correct Answer
Leo Laohoo Wed, 11/25/2009 - 15:15

Only the GLC-TX will support 10/100/100.  If you want the SFP to support 100mbps (only) then you need to look at the following link: 

Cisco 100BASE-FX SFP Fast Ethernet Interface Converter on Gigabit SFP Ports
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6578/product_data_sheet0900aecd801ba88e_ps5000_Products_Data_Sheet.html

The Cisco 100BASE-FX SFP on Gigabit SFP ports is supported on Cisco Catalyst 3750, 3560, and 2970 series switches.

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