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Router Dropping ARP entries

This might be too general a question but I will ask any way.

Why would a router drop 10%-20% of entries from its ARP table?

Thanks,

Khurshid

1 REPLY
Cisco Employee

Re: Router Dropping ARP entries

if the router runs out of memory or the arp table gets too big.

If you have a static route like 'ip route 0.0.0.0 0.0.0.0 serial 0' the router will have an arp entry for every ip destination.

If you have such a static route it is recommend to change it to sth like 'ip route 0.0.0.0 0.0.0.0 x.x.x.x' where x.x.x.x is the next-hop.

Other than that, I don't see a reason.

Could you provide us more info on the router, ios version and when/how do you detect the problem

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