Best practice to trunk two GB switches?

Solution 1:

Best thing to start with is setting up a Trunk Port on one of the four last Ethernet ports, as you will need to Tag all our VLANs out to the next switch. could be best to buy the same vendor (DLINK) as i've had to do a few firmware upgrades on DLINK's myself to get them to properly tag packets for and trunk

It also sounds like you want to setup an Aggregated link, this is possible with this switch but only in "Static Link Aggregation" mode, if you've got a Cisco 3700 handy you should be able to set it up using LACP

best to have a quick read of this; http://en.wikipedia.org/wiki/Link_Aggregation_Control_Protocol

btw.. the DGS-1248T has 4 SFP ports, not sure it's mini-GBIC ports on that device