I am adding an SG300 to replace an aging 2950x and am having an issue getting tagged VLAN traffic to pass from the SG300(1) to the secondary SG300(2). I have configured port ge51 on both SG300s in trunk mode and allow tag multiple vlans. I also have configured port ge52 on the SG300(1), and port fe2/0/6 on the 2950 in the same way. SG300(1) and the 2950 have been happily passing traffic for months. However, even after a factory reset and reconfig on SG300(2) the only passed traffic is the default vlan. The SG300(2) is new and running firmware 188.8.131.52. This should be simple stuff, but I am at a loss.
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