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routers copy frames?

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scottsee

Post subject: routers copy frames?

Posted: Sun Nov 21, 2010 2:08 am

Post Whore

Joined: Wed Feb 10, 2010 2:45 am
Posts: 1639
Location: Arizona
Certs: CCNA

I read this in the ICND1 book and was a little surprised to learn that routers make a copy of the original l2pdu before checking the FCS. What does it do with the original packet after it's copied? Send it to null? Why do routers need to copy the frames, why cant it just use the ones sent to their mac-address? They rip it apart and add new data link addressing anyway.

Maybe I'm just reading a little to deep into this, or misunderstanding it..

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HighFreak1c

Post subject: Re: routers copy frames?

Posted: Sun Nov 21, 2010 2:22 am

Ultimate Member

Joined: Wed Sep 01, 2010 7:14 am
Posts: 673
Location: New Zealand
Certs: CCNA, CCNA Voice, CCNA Security

Depends on how it's switched. Have a read here

Particularly the different switching methods:

•Process Switching
•Fast Switching
•CEF Switching
•dCEF Switching

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