Cisco 3750. We've been mixing it up with different switches and routers and IOS versions and today I discovered something horrible. A bug. Actually it wasn't particularly nasty but it was pretty weird.
My 3750 was using a gigabit port and fast ethernet port for trunking and everything else was on a VLAN between 1-9. The trunks were passing traffic from VLAN's 10,20,30,40, and 50. That's what was supposed to happen. Unfortunately until I set some of the free ethernet ports into corresponding VLAN's from the trunk, it would not pass that traffic through the trunk. Weird!! The more you learn, eh?
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