In a 3750 running 12.2(40)SE I have configured 2 port-channel groups (po1 and po2) linking to 2 different 6506/6509 switches. What I see is only one port-channel interface (po1) counters is working. Other one is always showing 0 input and 0 output rates although it's passing the traffic. From 6500 switch I can see the port-channel interface counter is increasing. How do I configure the 3750 so both port-channel group interface counters work?
Thanks for the reply Edison. In the 3750 both po1 and po2 are in forwarding states. However po1 is blocked his upsteam switch (6506) and po2 is forwarding to a 6509. Since traffic is using po2 interface I'd expect po2 interface counter should increase. But it's not the case. Also the broacast counter is acting wierd showing "Received 18446744073698874624 broadcasts (726 multicasts)".
Some information there but not enough. I need the entire spanning-tree output, not just the summary.
Couple of things I noticed:
1) You have one switch running in PVST+ while the other two on PVST.
2) The PVST+ is behaving as it should, blocking Vlan 70,71 and 75 when having multiple links towards the root while the switches running PVST aren't blocking any ports even if the switch itself isn't the root for such Vlan. You can see this behavior in the 3750 and the other 6509.
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