Both SFP and GBIC's are interface converters but different formats and are not interchangeable. The newer switches all come with SFP gig interfaces and GBIC's will not work with the newer switches, conversely, SFP will not work with older model switches with GBIC interfaces.
SFP and GBIC are just interface units that makes the users having a better choice of what to be able to connect to an switch, instead of having a switch model for single mode fiber(LH,ZX) , multi mode fiber, copper, CWDM and so on... The make an switch that have the logical interface and then just make the physical interface connectible and interchangeable in the switch.. Thus only needed to make fewer models.
The difference between SFP and GBIC are primarily just an big size difference, it's really impossible to connect an GBIC to an SFP port and vice versa, so there is no worries about connecting the "wrong" interface unit.
The gigastack gbic are for making an connection that you could stack switches with and only use one GBIC port instead of two if you use ordinary Ethernet GBICs for it.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.