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CPU usage of all nodes in MPLS network reaches 100 Percent

Publication Date:  2012-07-27 Views:  2 Downloads:  0
Issue Description
Router Version : V300R006C01SPC003
MPLS Network
Alarm Information
Device performance exceed threshhold,CPU usage threshhold = 90%,CPU Usage = 97%
Handling Process
we find the PMS send DISMAN_ping to DISMAN_trace discovery packet to device. but device NQA configuation is only for if this packet send device the CPU also process this packet,then CPU usage is high
We debug the SNMP packets on router during SNMP query from PMS and found below logs for same
Process running in PMS at the time of discovery 
Huawei_CPU_Unit           |Generic~Agent        | |AP~Huawei~Device~Match_Huawei_Hw|<*>|AP~Huawei~Device~Huawei_CPU_Unit 
Huawei_CPU_Unit           |Generic~Agent         | |AP~Huawei~Device~Match_Huawei_H3C|<*>|AP~Huawei~Device~H3C_CPU_Unit 
DISMAN_Ping                          |Generic~Agent        |                |AP~DISMAN_Ping_Match        |<*>|AP~DISMAN_Ping 
Huawei_Ping                          |Generic~Agent        |        |AP~DISMAN_Ping_Match        |<*>|AP~Huawei_Ping 
Huawei_MPLS_TE_LSP        |Generic~Agent         |        |NULL                         |<*>|AP~Huawei~MPLS~Huawei_MPLS_TE_LSP
Device NQA configuation:
nqa test-instance 2317 dmsv3r3.hyderabad
 test-type jitter
 destination-address ipv4
 destination-port 33434
 frequency 300
 datasize 64
 start now
Root Cause
We found that cpu usage goes high due to one process called AGENT which is for snmp-agent. After investigation we found this is caused when newly integrated PMS severs try to discover the devices. It will cause due to one DISMAN process run by PMS.
We find the PMS send DISMAN_ping to DISMAN_trace discovery packet to device. but device NQA configuation is only for if this packet send device the CPU also process this packet,then CPU usage is high
This is a bug in router and RnD will proved patch for the same
Patch Provided : V300R006C01SPH009
Temporary solution: 
stop the PMS system discovery packet for DiSMAN_ping and DISMAN_trace