Spanning-Tree Problem????

[jacob200]

Problem Description: We are having a spanning-tree problem that is affecting production. We are using Cisco 6506/09 switches running Native IOS.
1) When a an update goes out it appears that every port on the switch has to send out a topology change ack during the recalculation. I see all the individual system mac adresses from every port on every 48-port blade send this packet out. Why is this?
2) We have vlan 10 configured on one switch. We then have it daisy-chained via fiber to a another switch which has 5 blades configured as vlan 10. For some reason the first switch sends out a packet on the fiber (gig) connection to the second switch saying he has a root path cost of 5 and then all several hundred ports reply back that they have a root path cost of 9. This keeps happening over and over again. How can I go about resolving this?
I am sending across a quick text sniffer snapshot so you can see what is happening. Any help is appreciated.

 

[Whoheard]

Why are you running STP in the first place? Do you need it?

I could not see the snapshot.

I am not 100% sure, but what I think you are seeing is just normal traffic. At what interval are you seeing these updates? Can you describe the problem it is creating on the network?

Bob

 

[HMeyer]

Snapshot ?

Send the switches every 2 seconds the BPDU ?

The Path Costs are re-calculate on each Designated Switch. If the switch receive a BPDU, he add the Path Cost to the Path Cost in the BPDU. After this he send this BPDU out.