yes, I tested also L3 design and I found following issue already opened on Cisco TAC:CSCtx05704 - Incomplete ARP entries after RSUBut finally, after this issue will be fixed I believe that RSU can work also with L3.

Hello, this issue is fixed in 15.0(1)SE1, RSU is working now also for 2 switches in stack. Firstly, I upgraded 3750X stack to 15.0(1)SE1 in standard way (whole stack reload) and then I tested downgrade to 15.0(1)SE using RSU.archive download-sw /rol...