I wanted to start a discussion about the MAC address limit that MICE has as a standard limit of 5 per port. If I remember correctly, the history behind it ended up being that 5 MAC addresses was chosen as a happy middle ground to make router swaps by end users much easier on the end user, as well as the MICE tech committee. As someone that runs extension switches for 3 exchanges in addition to MICE, all of the other IXes have a 1 MAC address limit per port. I have found that maintaining these was not nearly as difficult as the original concern that was expressed at the MICE UG that lead to a limit of 5. With that being said, I would like to start a discussion about lowering the maximum MAC address limit to 1 with respect to the MICE extension switch that I operate. I feel that the benefits outnumber the risks, and with the experiences from the other 3 IXes, I do not think that the extra effort I will need to put in would be significant. Just to state the obvious, the South Front extension switch uplink that is connected to my extension would be a permanent exception, and short term exceptions would be permitted ahead of a router swap. Jeremy Lumby Minnesota VoIP 9217 17th Ave S #216 Bloomington, MN 55425 M: 612-355-7740 D: 612-392-6814 F: 952-873-7425 jlumby@mnvoip.com