STP problems?

[David Kondicz]

Hello,

we have some problems with packet lost on monitoring of "non used" devices in network. non used means it is not used to internet acces just stand by.

On 1 core sw i found this while i enable debug for spaning tree

STP: VLAN0050 heard root 28722-0cf5.a4ed.f980 on Gi1/0/23
STP: VLAN0030 heard root 32798-0cf5.a4ed.f980 on Gi1/0/23
STP: VLAN0050 heard root 28722-0026.5298.c480 on Gi1/1/3
STP: VLAN0133 heard root 32901-0026.5298.c480 on Gi1/1/3
STP: VLAN0050 heard root 28722-0024.50e6.1a00 on Gi1/0/24
STP: VLAN1800 heard root 34568-0024.50e6.1a00 on Gi1/0/24
STP: VLAN0840 heard root 33608-0027.0d9c.e440 on Gi1/1/3
STP: VLAN0099 heard root 32867-0027.0d9c.e440 on Gi1/1/3

(this SW is not a root switch. The root swith is connected throught portchannel100 for vlan 50 and 30)

there are 10ths of lines per second.

But if i us show spanning-tree root, it shows always the right root ports.

On other switches connected to this sw that i have this debug messages i have this messages in log:

Returning spanning tree port stats: GigabitEthernet0/6 (46C947C)
Returning spanning tree port stats: GigabitEthernet0/7 (46C9310)
Returning spanning tree port stats: GigabitEthernet0/8 (46C91A4)
Returning spanning tree port stats: GigabitEthernet0/6 (46C947C)
Returning spanning tree port stats: GigabitEthernet0/7 (46C9310)
Returning spanning tree port stats: GigabitEthernet0/8 (46C91A4)

Have you any ide what is happening? There is no rootchange or topology change.

[Paul Chapman · Accepted solution]

Hi -

Can you post the following:

1. Exact debug command(s) you are using
2. Output for "show spanning-tree vlan 30 detail"
3. Output for "show spanning-tree vlan 50 detail"
4. Output for "show spanning-tree summary

PSC

[David Kondicz]

Everything look ok.

Can you explain what is mean STP: VLAN0099 heard root  ?

And why am I receiving on one sw 20 log messages /sec with this message?

Thank you

[Paul Chapman]

Hi -

Either you're having an odd reconvergence event or you're misinterpreting the debug output.  If you can post the requested information, the forum members can assist you.

PSC