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arp cache

When I clear the arp cache, does this clear all mappings on the switch ports, and is it the same as the mac table ?

3 REPLIES
Silver

Re: arp cache

No it isn't the same and each are cleared independently. The arp cache is a layer3 database and used for a completely different purpose than the mac-address-table albeit complimentary. The arp cache provides the sending ip host with the mac address of the destination host and the sender builds the l2 frame with this info. Then when the frame gets to the switch, the switch benefits by having the mac address in the mac-address-table table so that it knows which specif port to forward the frame to instead of sending it out all ports the way a hub would.

HTH pls rate!

New Member

Re: arp cache

can you ellaborate how this works ?

Bronze

Re: arp cache

Hi carl,

clear arp-cache usage

To delete all dynamic entries from the ARP cache, to clear the fast-switching cache, and to clear the IP route cache, use the clear arp-cache EXEC command.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a0080238b70.html#wp1118127

Hope this helps you,

Thanks

Raj

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