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Cisco 3500 switches sending gratuitous arp

Why does the 3500 switch send out a gratuitous arp reply to broadcast(all FF's dest.) when you perform the copy tftp: flash: command or the copy tftp: running-config command? When you perform the copy running-config tftp: command it does not send the gratiutous arp reply to broadcast. Also, why would the 3500 put the broadcast address in the arp target hardware portion of the frame instead of it's own mac address?

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Re: Cisco 3500 switches sending gratuitous arp

I don't know why a gratuitous ARP is sent when transferring from a TFTP server, but gratuitous ARP packets typically use the broadcast address in the destination hardware address portion of the packet. Normal ARP requests just zero this field out.

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