today i use the SFP+ "SFP-10G-SR" in Cisco Catalyst 2960S-48TD-L connect to 1000BASE-SX SFP in 6509's module WS-X6724-SFP.
the port setting is trunk,but they don't work, even the led don't flush. then i also use the 1000BASE-SX SFP to replace SFP+ SFP-10G-SR in
2960S-48TD-L, then they cany working.
i look up the cisco data sheet , there are no data sheet to satament the 10G sfp+ can't down support 1G sfp. so i want to confirm the problem.
otherwise, the 10 SFP+ only can use for 10G SFP+ ; can't down suport 1G SFP.
this means: if you want to use the 10G SFP+ the other old device also need to replace.
thanks~for your help!!
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