I have got 17 Catalyst switches 5500 CatOS 5.5(9) in the network. They all have two connections to two core switches. However, port 1/2 is alway blocking at the leaf end for all VLANs. One of the core switches is the root for all VLANs.
I started monitoring the devices using SNMPc and found that two of those switches miss one poll every 2 or 3 minutes.
When I log in those switches and type sh cpu proc there are two precesses that are pushing the CPU utilisation of the switch to 60% these processes are THREAD and SptBpduRx my question is what do they indicate and where should I start looking to bring those processes down. When I compared them to the core switch they are up to 15 times higher than those shown in the core switch.
Can anyone give me some ideas as to what the problem might?
THREAD is the process that actually processes any SNMP request. The snmp process first receives any snmp request and then calls the THREAD process to process the request. The snmp process is invoked by the kernel when the system comes up. THREAD process will be invoked by the snmp process as soon as it receives a SNMP request
So please limit your polling to the cat5000 and let me know if that helps. It could be some rougue station who is polling this time a lot or mis-configuration in your snmp polling.
When I connected the sniffer I found that there was another system polling form the switch. When I changed the community string the THREAD process was still high in CPU but also discover that the switch started sending SNMP traps to a device that now does not exist. I cleared that command and the CPU went down, however not as low as I expected. During the weekend the threads process went down, as low as the the other switches, however the SptBpduRx and cdptimer processes are still much higher than in other switches. Do you have any idea why.
how high are you talking about ? Have you enabled portfast on all the user ports, may be there is lot of TCN being received. How many vlans you have ? I am just guessing as you have lot of bpdu traffic.
CPU in a switch is really not that critical for normal operation of the switch (switching packets), so you shouldn't see any user impact.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...