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RAX80 - CM1150v port aggregation cancels wired iMac ethernet (OK if single cable router-modem link)
RAX80 & CM1150v with aggregated link & gigabit Xfinity giving me consistent gig+ speeds using Xfinity app. Imac wired to RAX80 cannot complete a speedtest due to ethernet disconnecting ("fix": ...
RAX80 arrangement: WAN port & port #1 are LAG to modem; iMac is port #3 cabled direct without switch; port #2 is an unmanaged switch; ports #4 & #5 are managed switches (because ports #4 & #5 "must be" managed switches if used).
Other devices still function on LAN after iMac disconnects... for instance a wired Dell laptop accesses the web via router / network; various WIFI devices unaffected as well. Meanwhile Xfinity app (on iPhone, WIFI to RAX80) says speed 1.2 Gb/sec over LAG to modem / web.
A2cents
What happens if you connect the Mac to one of the switches?