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Community Member

C6513 intermitten every 30 second

Hi,

my C6513 intermittent every 30 second.

reply for 30 second and timeout 6 times and reply again continuosly.

Attached the sample.

Please help?

Regards,

Lian

8 REPLIES
Bronze

Re: C6513 intermitten every 30 second

Lian-

Are you running CEF? If not, the 6500s use a redirect mechanism to move packets that leave the sup module. This causes high CPU, so there is a built-in throttle mechanism to prevent DoS type attacks. So, the sup module can drop your pings because they come in at a high rate. Try enabling CEF and see if your issue goes away.

HTH,

Paul

Community Member

Re: C6513 intermitten every 30 second

Paul,

Yes, my C6500'S was'nt run CEF, it is neccessary to config CEF in my all C6500's, can you show me to config CEF.

Attached 2 of C6500's config.

Lian

Community Member

Re: C6513 intermitten every 30 second

Paul,

Yes, my C6500'S was'nt run CEF, it is neccessary to config CEF in my all C6500's, can you show me to config CEF.

Attached 2 of C6500's config.

Lian

Bronze

Re: C6513 intermitten every 30 second

Lian-

For IOS all you need to enter is:

ip cef

You may also want to take alook at this: http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/catos/8.x/configuration/guide/cef.html

HTH,

Paul

Community Member

Re: C6513 intermitten every 30 second

Paul,

one more question what is benefit and risk if i implement of ip cef command?

Regards,

Lian

Bronze

Re: C6513 intermitten every 30 second

Lian-

I'm not really aware of any risk. Benefits are listed here: http://www.cisco.com/en/US/docs/ios/12_1/switch/configuration/guide/xcdcef.html

HTH,

Paul

Community Member

Re: C6513 intermitten every 30 second

Hi Paul,

Thanks very much about CEF your very helpful.

Paul,

anoter question

How to find high broadcast or multicast traffic on C6500 source and destination address on switch or per interface?

Regards,

Lian

Community Member

Re: C6513 intermitten every 30 second

Hi Paul,

thanks for you help i just reload my c6500

and now back to normal.

Thanks

Lian

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