871 high CPU utilization

[catalin.stan]

Hi,

I have a 871 and when I'm downloading a bigger file (over 100 MB) or uploading via FTP the CPU goes to 99%.

I have tested this with basic configuration (only nat and dhcp service configured). I have install the latest IOS version that is supported on the router (c870-advipservicesk9-mz.124-24.T8.bin) but I still have the same problem.

Can someone please let me know if this is a normal behavior for 871. Will a flash/RAM upgrade will help?

Thank you

[Joseph W. Doherty]

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The sum of all your interface rates, either all ingress rates or all egress rates (don't count both at the same time).

[paolo bevilacqua]

Seems to me you want to use the router for inter-vlan router.

As other have indicated, It does not have enough performances to do that, no matter how much RAM you stuff in it.

You need a L3 switch for inter-vlan routing.

[catalin.stan]

I'm don't want to use this router as inter-vlan switching.

I just need it for gateway/nat/dhcp.

I've reconfigured the interfaces so I only have the native vlan. I have the same problem with this configuration.

It's very strange that a transfer for a file less then 100M works fine and for 200M + the CPU goes to 98%.

test#sh run

Building configuration...

Current configuration : 1244 bytes

!

version 12.4

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname test

!

boot-start-marker

boot-end-marker

!

logging message-counter syslog

!

no aaa new-model

!

!

dot11 syslog

ip source-route

!

!

ip dhcp excluded-address 192.168.200.1 192.168.200.10

!

ip dhcp pool LAN192

   network 192.168.200.0 255.255.255.0

   default-router 192.168.200.1

   dns-server 8.8.8.8

!

!

ip cef

no ipv6 cef

!

multilink bundle-name authenticated

!

!

!

!

!

!

archive

log config

  hidekeys

!

!

ip ssh version 1

!

!

!

interface FastEthernet0

!

interface FastEthernet1

!

interface FastEthernet2

!

interface FastEthernet3

!

interface FastEthernet4

description outside

ip address dhcp

ip nat outside

ip virtual-reassembly

duplex auto

speed auto

!

interface Vlan1

ip address 192.168.200.1 255.255.255.0

ip nat inside

ip virtual-reassembly

!

ip forward-protocol nd

no ip http server

no ip http secure-server

!

!

ip nat inside source list NAT_ACL interface FastEthernet4 overload

!

ip access-list extended NAT_ACL

permit ip 192.168.200.0 0.0.0.255 any

[paolo bevilacqua]

What is the speed of your internet service ?

[catalin.stan]

5 Mbs

[paolo bevilacqua]

Sorry, I don't know the reason.

I would update IOS again, that requires a dram and memory upgrade too.