I have two Cisco Catalyst 4510R+E systems that I am interconnecting, using the interfaces on the sup's (both have dual Sup7-E's.) They are marked 1G/10G Uplinks (SFP/SFP+) on the sup above the interfaces. I have ordered 10G SFP+ modules, but in the meantime, I already have 1G SFP's available (GLC-SX-MM), and I have inserted one in one of the sup interfaces (Te5/1), and see the following:
Switch#sh int status mod 5 Port Name Status Vlan Duplex Speed Type Te5/1 notconnect 1 full auto 1000BaseSX Te5/2 notconnect 1 full auto No XCVR Te5/3 inactive 1 full auto No XCVR Te5/4 inactive 1 full auto No XCVR
So, does this mean that the sup autosenses the module speed (in this case, 1G) and when I get the 10G modules, I can just replace the 1G mod's with the 10G mod's, and the links will come back up at 10G? (the infrastructure fiber as well as the patch cables are all OM-3 MM, so they're good to go for 10G…) Or, is there some command needed to set the interface to be 10G rather than 1G?
Best Answer
In a word: YES.
Unless you want to do something like force a 10G SFP+ to link at 1G, you don't have to do anything but plug it in.