The Catalyst 3750G-12S-S is capable of terminating 12 1000BaseSX connections. You have to buy 12 SFPs (GLC-SX-MM) along with the switch. If you want higher density you can either stack two 3750G-12S-S or go for a modular chassic based switch (4500 or 6500)
Any specific reason you require GBICs? The direction is to move towards SFPs. Most of the GBIC based low end models (3500XL, 3550) are End of Sale now and cannot be ordered directly from Cisco but you maybe able to buy a refurbished or used piece from one of many online retailers. Again if there is no genuine requirement to use GBICs I advise you look at the SFP models.
Just one more comment for your information; you probably already know this but I will say it anyway. If you have a GBIC based switch on one side there is NO issue connecting it to an SFP based switch on the other side as long as you use the matching GBIC and SFP (both SX). The type of patch cable required will be different also since the SFP has an LC connector while the GBIC is SC based.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...