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stp issue

malel2015
Beginner
Beginner

Hi,

 cpu is going high .

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
5692 1497442 370423650 498 24.3 24.7 24.8 1088 fed
5693 299403 398196125 21 0.10 0.12 0.11 0 platform_mgr
5694 552402 20974250 2215 49.5 49.5 49.4 0 stack-mgr
6230 4182549 381897756 1008 13.6 13.3 13.7 0 pdsd
6233 719770 53077418 13 0.05 0.05 0.05 0 oscore_p
6241 3574391 101255621 841 0.05 0.02 0.03 0 cpumemd
11468 280969 274462535 17 0.15 0.07 0.07 0 wcm
11472 4171836 245410290 483 7.43 7.47 7.59 34816 iosd

 


VLAN0001 is executing the rstp compatible Spanning Tree protocol
Number of topology changes 24386 last change occurred 00:14:08 ago
from TenGigabitEthernet1/1/2

 


 

There are some ports which is connected to phone and configured only voice vlan

What I need to do to solve this issue

 

Thanks

 

 

3 Replies 3

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

 

Just a quick check but can you make sure all ports connected to end devices are configured with portfast otherwise you will see a lot of TCNs. 

 

Jon

portfast configured 

sbhadrav@cisco.com
Contributor
Contributor

A Layer 2 spanning-tree instance runs for every VLAN configured on a Layer 2 switch by the per-VLAN spanning-tree (PVST) feature. The CPU time utilized by spanning tree varies depending upon the number of spanning-tree instances and the number of active interfaces. The more instances and the more active interfaces, the greater the CPU utilization.

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