08-12-2019 08:02 AM
Hello,
We are experiencing a high usage CPU on one of our routers. We checked the cpu usage per process and we found that IP Input process is the one with high cpu usage. We would like your support in order to fix this issue.
Thank you in advance.
08-12-2019 08:44 AM - edited 08-12-2019 08:45 AM
what is the model of the router ? what is IOS version
can you post show process cpu | ex 0.00%
show processes cpu sorted
08-13-2019 12:20 AM
our router model is as below:
show version
Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 15.0(1)M7, RELEASE SOFTWARE (fc2)
and HW type is as below:
-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO3845-MB FOC153325D0
Below is the result of command show process cpu | ex 0.00%:
RT_OBR_PORT_01#show processes cpu | ex 0.00%
CPU utilization for five seconds: 97%/39%; one minute: 96%; five minutes: 92%
PID Runtime(uS) Invoked uSecs 5Sec 1Min 5Min TTY Process
41 2080648000 1480460 1405 0.23% 0.22% 0.23% 0 Net Background
45 1623526112 1195960 12131 1.27% 1.27% 1.27% 0 Per-Second Jobs
83 228000 279 817 0.07% 0.12% 0.05% 706 SSH Process
129 115040000 36780683 3 0.07% 0.06% 0.07% 0 IPAM Manager
133 2024751424 818709436 296 55.35% 54.42% 53.42% 0 IP Input
206 735628000 288782077 2 0.39% 0.39% 0.39% 0 HQF Shaper Backg
325 371188000 98134022 3 0.31% 0.25% 0.24% 0 CH_GT96K Backgro
08-13-2019 12:21 AM
08-13-2019 01:44 AM
08-13-2019 03:00 AM
08-13-2019 05:29 AM
08-13-2019 08:18 AM
Most of our traffic including Internet and WAN traffic are going through int gi0/1. Below is the result of show ip int brief:
RT_OBR_PORT_01#show ip int brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.102.246.13 YES NVRAM up up
GigabitEthernet0/1 10.100.13.129 YES NVRAM up up
FastEthernet0/0/0 unassigned YES unset up down
FastEthernet0/0/1 unassigned YES unset up down
FastEthernet0/0/2 unassigned YES unset up down
FastEthernet0/0/3 unassigned YES unset up down
FastEthernet0/1/0 unassigned YES unset up down
FastEthernet0/1/1 unassigned YES unset up down
FastEthernet0/1/2 unassigned YES unset up down
FastEthernet0/1/3 unassigned YES unset up down
Serial0/2/0:0 unassigned YES unset down down
Serial0/2/0:1 unassigned YES unset down down
Serial0/2/0:2 unassigned YES unset up up
Serial0/2/0:3 unassigned YES unset down down
Serial0/2/0:4 unassigned YES unset down down
Serial0/2/0:5 unassigned YES unset up up
Serial0/2/0:6 unassigned YES unset down down
Serial0/2/0:7 unassigned YES unset down down
Serial0/2/0:8 unassigned YES unset down down
Serial0/2/0:9 unassigned YES unset down down
Serial0/2/0:10 unassigned YES unset down down
Serial0/2/0:11 unassigned YES unset down down
Serial0/2/0:12 unassigned YES unset down down
Serial0/2/0:13 unassigned YES unset down down
Serial0/2/0:14 unassigned YES unset down down
Serial0/2/0:15 unassigned YES NVRAM up up
Serial0/2/0:16 unassigned YES unset down down
Serial0/2/0:17 unassigned YES unset down down
Serial0/2/0:18 unassigned YES unset down down
Serial0/2/0:19 unassigned YES unset down down
Serial0/2/0:20 unassigned YES unset down down
Serial0/2/0:21 unassigned YES unset down down
Serial0/2/0:22 unassigned YES unset down down
Serial0/2/0:23 unassigned YES unset down down
Serial0/2/0:24 unassigned YES unset down down
Serial0/2/0:25 unassigned YES unset down down
Serial0/2/0:26 unassigned YES unset down down
Serial0/2/0:27 unassigned YES unset down down
Serial0/2/0:28 unassigned YES unset down down
Serial0/2/0:29 unassigned YES unset down down
Serial0/2/0:30 unassigned YES unset down down
Loopback251 10.100.2.251 YES NVRAM up up
NVI0 10.100.2.251 YES unset up up
Tunnel4 172.16.4.9 YES NVRAM up down
Tunnel6 172.20.1.5 YES NVRAM up up
Tunnel10 172.16.2.2 YES NVRAM up up
Tunnel12 172.16.3.49 YES NVRAM up down
Vlan1 unassigned YES NVRAM up down
Vlan2 10.100.18.62 YES NVRAM up down
Vlan4 10.100.19.62 YES NVRAM up down
RT_OBR_PORT_01#
08-13-2019 11:51 PM
reliability 255/255, txload 150/255, rxload 224/255
Is QoS enabled?
RxLoad is pretty high. I believe the cause of the High CPU is that your router has hit the limit.
No Total Output Drops probably means QoS is enabled or the WAN link is higher than the limits of the router.
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