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

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