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Cisco Bug: CSCul01316 - 3850 unsolicited reply to arp probes with non-zero target mac address

Last Modified

Nov 27, 2020

Products (1)

  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases


Description (partial)

Whenever an IP end point sends an ARP probe ( With a non-zero target MAC address ) to enable duplicate IP address detection, 3850 replies to such ARP probes. This reply has the same IP address the IP end point sent the ARP probe for and switch mac address. This reply packet would prevent the IP end point from successfully initializing the IP stack and results in lack of IP connectivity. 3850, however does not respond to such ARP probes when the target MAC address is set to zero.

For Example:  If a DHCP server assign an IP address to a printer  ( Brother model) and the printer sends an ARP probe,  It receives a reply from 3850 and hence it will not complete the IP stack initialization and remain without IP connectivity.

When an IP endpoint tries to get an IP address via DHCP and uses ARP probe to detect duplicate IP address before owning that IP address, it receives  a reply from 3850.
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