If I understand your question: you have two sg500 switches, made a LAG group with one port on both switches (that act as one switch in stack) and then put an other switch with two ports in LAG with one cable to both the sg500 switches? Then yes, it should work to create redundancy. I’m not sure if it also creates a performance increase, maybe someone else can answer that with tested numbers.
Thank for your reply, could you help me out at the same time while testing the performance of a LACP over two switches of one stack?
Could you connect a SGE2000 switch with four CAT6 UTP cables to the SG500 stack (two cables to each switch of the stack) and test why the SGE2000 switche dont work correctly as simple access switches for end systems like desktops (the ports take very long to go into forwarding and it seems the LACP port on the SG500 stack turns off and on). When the ports start forwarding the connection is stable but i never had this with sg300-52 or srw2048 switches in the same setup. I added my configs and question here: https://supportforums.cisco.com/message/4155309#4155309
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