Tuesday, September 28, 2010

Notes on a Scandalous Switch

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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