03-22-2008 12:35 PM - edited 03-05-2019 09:55 PM
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!
03-22-2008 01:34 PM
You may be experiencing a common Spanning-Tree behavior. One port (or bundle port on this case) is forwarding while the other port is in blocking mode. This is to avoid a network topolody loop.
HTH,
__
Edison.
03-22-2008 01:54 PM
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)".
#show int po1 | incl rate
Queueing strategy: fifo
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 29000 bits/sec, 9 packets/sec
#show int po1 | incl broadcast
Received 18446744073698874624 broadcasts (754 multicasts)
#show int po2 | incl rate
Queueing strategy: fifo
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
#show int po2 | incl broadcast
Received 18446744073709535763 broadcasts (7445 multicasts)
03-22-2008 05:31 PM
Let's see show spanning-tree from the 3 switches.
03-22-2008 09:03 PM
03-23-2008 08:42 AM
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.
Thanks
03-23-2008 01:16 PM
6506 is running hybrid OS and pvst+ is the default. There is no pvst option in hybrid OS.
I included everything from show spantree in the log. It's fairly long list.
Back to my original question, I suspect interface input/output rate counters are showing 0s is because of the bug in IOS. I see the total packets input/ouput counters are increasing.
Thanks Edison!
03-23-2008 04:37 PM
Output looks fine. You may be onto something with the counters. What version of IOS are you running on the 3750 switches?
03-23-2008 05:12 PM
Running image on the 3750 is c3750-ipbasek9-mz.122-40.SE.bin. I may want to give the latest 122-44.SE1 a try.
#sh ver | incl IOS
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(40)SE, RELEASE SOFTWARE (fc3)
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