http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800a9679.shtml#q12However, you can use GNS3 (Gui for Dynamips), use Cisco 3745s with the 16 port switching module and you can do all kinds of interesting stuff with layer 2 and layer 3 including HSRP, GLBP, etc, etc.
www.gns3.netBilly