HelloSince Core1 and Core2 are members of a VSF stack and all 6 6300 are also a VSF stack all uplinks could be in the same LAG. A LAG can have up to 16 physical ports on CX 6300 and 8 on the 5406R (assuming latest firmware).Having 2 LAGs between both VSF stacks will introduce problems with STP. If STP is enabled then one of the LAGs will be blocked. If it is not enabled you will have a loop. It is possible to tag different VLANs on both LAGs and configure different MSTP instances.However this is not a typical scenario with switch stacks since one of the main benefits of stacking is to avoid complicated MSTP configuration.Having LAG member port from every member should eliminate east-west traffic. The VSF stack has local-first forwarding for unicast traffic forwarded via LAGs. That means if a member switch has a local port member of the LAG the traffic is forwarded to it and the LAG hash algorithm is ignored.
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