路由器CPU占比过高

我公司的一台MSR路由器设备，近期出现CPU峰值很高的问题，经过基本的排查，基本排除硬件问题，个人感觉是系统CPU显示的DNS部分占比比较奇怪，

具体请看图2 图3 ,内网也查过没有风暴

设备为H3C MSR 3016 v5 系统

H3C Comware Platform Software
Comware Software, Version 5.20, Release 2207P45, Standard
Copyright (c) 2004-2011 Hangzhou H3C Tech. Co., Ltd. All rights reserved.
H3C MSR30-20 uptime is 0 week, 1 day, 18 hours, 43 minutes
Last reboot 2018/07/11 15:51:41
System returned to ROM By Power-up.

CPU type: FREESCALE MPC8349 533MHz
256M bytes DDR SDRAM Memory
4M bytes Flash Memory
Pcb               Version:  3.0
Logic             Version:  2.0
Basic    BootROM  Version:  3.17
Extended BootROM  Version:  3.17
[SLOT  0]CON                       (Hardware)3.0    (Driver)1.0,   (Cpld)2.0
[SLOT  0]AUX                       (Hardware)3.0    (Driver)1.0,   (Cpld)2.0
[SLOT  0]GE0/0                     (Hardware)3.0    (Driver)1.0,   (Cpld)2.0
[SLOT  0]GE0/1                     (Hardware)3.0    (Driver)1.0,   (Cpld)2.0
[SLOT  0]CELLULAR0/0               (Hardware)3.0    (Driver)1.0,   (Cpld)2.0
[SLOT  6]MIM-2FE                   (Hardware)3.0    (Driver)1.0,   (Cpld)0.0