I see the exact same behavior on almost all my 3750 (none G, G, X, ... types) type switches. I worked with TAC on it and got the answer that this is a purely "display bug only" and can "be ignored". I did not like this answer. So I kept digging. Cisco actually has a guideline / recommended setup for 3750X switches on their website which I find very interesting. I learned about it during Cisco Live this year and would never have found it otherwise.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...