topic Re: sever CPU Utilization in Switching

sever CPU Utilization

sherif safwat — Thu, 07 Mar 2019 19:54:43 GMT

Dears,

we have 2811 router with multiple servers connected to it's lan from which there are monitoring servers in between , the router suffers always from high cpu utilization

configuration has alot of ACLs & NAT & IPSEC Tunnel with wan bandwidth 20 M

Is there any method to reduce the high cpu utilization shown below !!

CPU utilization for five seconds: 90%/80%; one minute: 93%; five minutes: 90%

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

104 737029848 427864243 1722 5.45% 5.65% 5.65% 0 IP Input

253 63392216 11081854 5720 1.04% 1.15% 1.12% 0 IP NAT Ager

260 82602372 137425723 601 0.64% 0.64% 0.66% 0 PDU DISPATCHER

2 2475488 1070922 2311 0.48% 0.41% 0.35% 0 Load Meter

270 3696 267 13842 0.48% 0.49% 0.18% 514 Virtual Exec

164 39209976 1101640874 35 0.40% 0.29% 0.36% 0 HQF Shaper Backg

259 53255128 146875160 362 0.24% 0.31% 0.34% 0 IP SNMP

256 17800088 155666048 114 0.24% 0.16% 0.17% 0 PPP manager

18 149527460 33336738 4485 0.24% 0.16% 0.16% 0 ARP Input

148 212776 5308439 40 0.08% 0.00% 0.00% 0 bsm_xmt_proc

Re: sever CPU Utilization

Joseph W. Doherty — Sun, 24 Feb 2013 11:40:28 GMT

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The 2811 is a little small for 20 Mbps. Your 5 second rate shows most of the CPU being consumed by "interrupt", which normally reflects overall traffic loading.

However, ideally "interrupt" CPU should be almost all your CPU, and with tunnels, if you're fragmenting, you're CPU usage will be higher than necessary. In other words, you might be able to improve CPU utilization if you optimize your configuration, assuming it's not optimal.

Re: sever CPU Utilization

jawad-mukhtar — Sun, 24 Feb 2013 15:02:35 GMT

Have u enable any type of logging for ACLs

Re: sever CPU Utilization

sherif safwat — Mon, 25 Feb 2013 09:34:27 GMT

No , Logging is not enabled for ACL , also minimized ACL as much as possible

regarding tunnel , how to check fragments through tunnels and how to adjust them !

Re: sever CPU Utilization

Joseph W. Doherty — Mon, 25 Feb 2013 09:59:00 GMT

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http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml