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Cisco Bug: CSCur30273 - 3850 duplicates pass-through ARP packets

Last Modified

Nov 27, 2020

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases

15.0(1)EZ3 16.1(0)

Description (partial)

When ARP request/Reply packets enter an access or trunk interface and its L2 switched to an another access or trunk interface in same VLAN the ARP request/Reply packets gets duplicated. This means that when one ARP packet enter the switch two identical ARP packets exit the switch. We have seen IP Packets getting duplicated. This only seems to affect ARP packets.

L2 switching with lanbase license
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