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New Member

CAM vs. ARP

Hello all.

I was having a discussion with someone about the difference between a "CAM" table, vs an ARP table in the context of a switch.

Can someone clearly define the difference (if one) and point to documentation? Thanks!

3 REPLIES
New Member

Re: CAM vs. ARP

From my understanding CAM is the Content−Addressable Memory which is available per port on the switch to speed up ethernet ID lookup. The ARP table on the other hand resides in main memory and requires more time to access.

Please see: http://www.eetasia.com/ARTICLES/2000MAY/2000MAY03_MEM_NTEK_TAC.PDF

Hope this helps.

Bronze

Re: CAM vs. ARP

CAM maps ports to the MAC addresses found on the ports. ARP matches IP addresses to MAC addresses.

HTH.

Mark

New Member

Re: CAM vs. ARP

The switching function of a switch, therefore, does not use the ARP table. Switching works on Datalink addresses, and does not use IP addresses.

However, management functions in a switch, like pinging or telnet, would require an ARP cache, as those protocols use the IP protocol.

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