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New Member

can CEF be used on a 2821 router's serial interface w/o issue

I am experiencing input queue drops and I noticed that CEF is enabled globally but turned off on the serial1/0 link which is a 45Mb connection to  the Internet.  Is there any reason that CEF cannot be run on a serial link which faces the Internet.

3 REPLIES
Cisco Employee

can CEF be used on a 2821 router's serial interface w/o issue

Hello Frank,

I know of no compelling reason to have CEF deactivated on any interface, including a serial link towards internet. How do you know that the CEF is disabled on that interface?

Best reagrds,

Peter

New Member

can CEF be used on a 2821 router's serial interface w/o issue

Thanks for responding Peter.  These commands are on the interface in question: no ip route-cache cef and no ip route-cache.

Cisco Employee

can CEF be used on a 2821 router's serial interface w/o issue

Hello Frank,

Thank you. I see - the CEF is deactivated indeed on the interface.

As I suggested, in normal network operation, there is no reason to deactivate CEF on an interface. You can try reenabling it again.

Best regards,

Peter

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