arp cache

Unanswered Question
Mar 19th, 2007

In the attached picture.

ARP entries for the Internet are stored only on core layer, not on the Router.

Router has a configuration for access Internet that NAT and default gateway.

And routing for internet on core switches is default gateway as well.

Someone said arp only on core is the problem. Is it true?

I'm thinking that it(only cores has arp entries for Internet)is normal thing because Core is bridge between static and RIP.

Can you pls explain this situation?

Where ARP entries should be exist?

Thank you.

I have this problem too.
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nyr.hakeem-habeeb Fri, 03/23/2007 - 09:28


Generally speaking ARP enrties are localized within a layer-2 domain i.e. within a vlan should should only have entries of hosts within that vlan. Hence in your scenario a p2p link connections to ur ISP would be a single layer-2 domain and therefore arp entries should reside on you devices terminating these connections.

I hope this clears up things a bit.



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