Sporatic Connections when fiber uplinks plugged in

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Sep 16th, 2008
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I plugged my laptop into our core switch which is a 3Com and that is uplinked to our cisco 2801. We have 2 fiber uplinks off the 3com. I can ping other machines on that switch when the uplinks are not plugged into it but when the fiber uplinks are added, I get sporatic ping results. 3Com is pointing fingers at the cisco router but the traffic shouldnt even hit that if the devices are on the same switch. Any ideas?

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Giuseppe Larosa Wed, 09/17/2008 - 03:23
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Hello Matt,

on the 2801 disable ip proxy-arp on the vlan interface or router interface of interest and retry.


use :

no ip proxy-arp in interface config mode


Hope to help

Giuseppe


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