MGBSX is supported with GLC-SX-MM and SFP-GE-S, so yes, the link should come up and yes you may use trunking between both switches without problems - assuming you understand the configuration of the SG300.
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We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...