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Community Member

Process switching on CAT3550 with CEF enabled

Hi

I have a cisco 3550 acting as a backbone router for our network with no end PCs attached just routers/layer 3 switches.

Using the sh int stats command it looks as though ALL traffic is been processed switched not CEF in hardware any ideas if this might be correct or am i miss reading the output.

The sh proc cpu show high CPU load of 20+% of which 19 ish % is hardware interrupts.

I can attached config if required. IOS version is : 12.1(22)EA5a

L3-SW1-FHH#sh int stats

Interface Vlan1 is disabled

Vlan99

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 947 74802 971 70916

Route cache 0 0 0 0

Total 947 74802 971 70916

Vlan121

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 20913 1515128 2968 345539

Route cache 5 680 0 0

Total 20918 1515808 2968 345539

Vlan800

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 12 948 398 29464

Route cache 0 0 0 0

Total 12 948 398 29464

Vlan819

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 5242 669532 19190 1363256

Route cache 1 110 0 0

Total 5243 669642 19190 1363256

Vlan829

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 205 23864 622 57720

Route cache 0 0 0 0

Total 205 23864 622 57720

Vlan999

Switching path Pkts In Chars In Pkts Out Chars Out

Processor 1409 114242 1182 70920

Route cache 0 0 0 0

Total 1409 114242 1182 70920

2 REPLIES
Blue

Re: Process switching on CAT3550 with CEF enabled

it does seem you have some routeCache hits.

verify your 'flow' configuration by checking the VLAN interfaces for the 'no ip route-cache cef' command. remove this with the 'ip route-cache' command if you require it to be used.

one really good way to understand how CEF is operating in your environment is to use network accounting for CEF.

please see the following link for more info on network accounting for CEF: (as well as more CEF info:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca7cc.html#wp1000997

Community Member

Re: Process switching on CAT3550 with CEF enabled

thankyou for the fast responce, cef is enabled on all the SVIs as below.

interface Vlan819

description COIN Core Vlan

ip address 10.255.255.7 255.255.255.224

no ip redirects

no ip unreachables

no ip proxy-arp

!

will have a look at the link you attached to see what i can do next.

Regards

Kev

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