I am looking at a 500 node network with a 4510R at the MDF. I need to replace 3 IDF switches, each of which has 10-24 switches uplinked to it. Right now they are linked to the IDF at 100Mbps, and I am upgrading the backbone to Gigabit using the 6 GBIC line cards for the 4510, so would like to extend at least 1Gbps to each access switch. I have 4 strands of fiber at each IDF which I can use to uplink the new switches at 2Gbps GEtherchannel tot he 4510. So, it would be: Access switch -> IDF Switch -> MDF. This network is a campus network, and the cabling design cannot be changed at this time. I was wondering about using the 3750G-24TS at the IDF's. It has 24 10/100/1000 ports and 4 SFP ports. The access switches are all 2950T-24's. These are 24 port 10/100 switches with copper gigabit uplinks. My question is, would the 3750G-24TS be good in the IDF? The client will not buy a more expensive modular switch like the 4506 or similar which I would prefer for the IDF's. I can't find in the Cisco docs on the 3750 if all 24 of those ports can be trunk links, ie, are they non blocking or not. Can anyone shed some light here?