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lost arp response

shepyard1980
Community Member

I have a cisco WS-C3750-48P (factory default config) that I have connected to a device ( AM335x processor board ) when I try and ping the device from a laptop also connected to the switch I can see the arp request sent to the board and I can see an arp response from the board coming back but the switch doesnt forward that arp response to the laptop! How do I go about troubleshooting why the switch is not passing on the response?

3 Replies 3

Philip D'Ath
Meraki Community All-Star
Meraki Community All-Star

Has the switch got anything in its log? Perhaps the ARP response packet is malformed, or the layer2 frame is malformed.

I cant see anything I have tried all sorts of debug commands, which one should I use? There is also no errors or drops in the show interface command! This device works fine on other switches just not on Cisco's

Philip D'Ath
Meraki Community All-Star
Meraki Community All-Star

What is the output of "show interface" for the port the device is plugged in?