08-24-2006 09:43 AM - edited 03-03-2019 04:40 AM
Hi
In my core switch when i do sh proc cpu i see overall utilization of the sup(SUP1A with MSFC-3) 30-34%, the 2 contributing processes to this high utilization are sptbpdutx(14%)and sptbpdurx(15%). What is the cause of high utilization of these 2 processes and how to detect it.
Regards
08-24-2006 09:43 AM
Hi Vijay
When i see output of command "sh spantree statistics 1/1 2" then i see config bpdu's xmitted (port/VLAN) increasing every sec while config bpdu'd recieved and TCN bpdu's not increasing, and this happens at each trunk port of core switch, hellow timer is set to default 2 sec, what i feel is i should increase the hello timer since it is sending config bpdu's every 2 sec. what do u feel ?
Regards
08-29-2006 11:23 PM
Hi,
Those two process are related to Spanning tree.
You need to check the stability of spanning tree in the network to trace the root cause.
-VJ
08-30-2006 04:17 AM
If you are doing a lot of trunking then "manually" prune off any vlans that are not needed across trunked links , if you have it wide open then the switch has to allocate spanning tree instances to all vlans allowed which drives up the cpu...
08-30-2006 05:44 AM
But can i increase the hello timer from 2 sec since config bpdu are sent every 2 sec which is causing high config bpdu transmit thru the trunk.
Regards
08-30-2006 09:30 AM
I would not mess with the default values , if spanning is causing high cpu there is a reason for it .
08-30-2006 10:41 PM
Pruning is the only thing which i can do, is there anything else also which i should look for to reduce this utilization.
Regards
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