Mixing SFP's with different Speeds

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http://serverfault.com – 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? Thanks in advance, Ryan (HowTos)