Thanks Mark and all who replied... That is exactly the type of information I was looking for. I also found the following very informative: http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_white_pa per09186a0080211f39.shtml Thanks, Don >>You my find this useful: >>http://www.cisco.com/warp/public/105/rtgupdates.html