Below are the details and design.
· MDF1 and MDF2 are adjacent racks in the server room and two racks are linked via Fiber.
· X 620 Core1 and X620 Core 2 are connected to each other via ports 15 & 16 and link aggregation enabled. Port 15 – port 15 and port 16 – port 16.
· In all X440 switches there are 48 ports in the front which is fully utilized from 1-48.
· 4 No’s of 10Ge ports are available in the back, 49-52.
· What we tried to do is, in MDF1 we wanted to stack the 3 X440 and in MDF2 another stack.
· As per documentation, in X440 we can only use ports 51 & 52 for stacking.
· As per our design, on uplink from core 1 and I uplink from core 2 should reach each of the X440 in each stack.
· But since ports 51 & 52 are currently marked for stacking, we plugged uplink at 49 – 50 ports.
· But ports are not enabling.
· Whereas if we are plugging in the uplink cable to ports 51 – 52, it works.
· One more think we noticed is when 2 uplinks are provided from core 1 / core 2 to X440 we are getting packet loses.
· This is the current situation.
· Also we have IDF1 / IDF2 / IDF3 where we have about one switches each which need to be connected to core 1 and core 2.