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Ryan
Asked: 2012-07-18 14:46:20 +0800 CST

Mixing SFP's with different speeds

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I need to install new SFP's in a location; however, I need them to connect to existing switches and I'm not sure what SFP type they are. All I know is I've got MM Fiber.

If I installed Cisco GLC-SX-MM 1000Base SFP's, would that cause an issue if the other end of that fiber was connected to a 100Base SFP, or do I need to have matching speeds on both ends?

networking cisco switch fiber sfp

3 Answers

  1. If I installed Cisco GLC-SX-MM 1000Base SFP's, would that cause an issue if the other end of that fiber was connected to a 100Base SFP? Or do I need to have matching speeds on both ends?

    Your speeds must match

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  2. There are some handy links in this other serverfault question which might help.

    How compatible are sfp's really?

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  3. It depends on what you mean by cause an issue. It won't break anything but you won't get a link either. They must be the same. SFPs are hot-swappable so you can remove it to inspect the label without damaging it. Additionally, you can do a show interface status to have the switch tell you the model SFP that is installed in a port.

    Not only can you not mix speeds but you should stay away from mixing sfp models as well.

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