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Cisco Bug: CSCvv48839 - double arp with L2 NAT

Last Modified

Sep 03, 2020

Products (1)

  • Cisco Industrial Ethernet 4000 Series Switches

Known Affected Releases

15.2(4.0.1)

Description (partial)

Symptom:
IE-4000-4GS8GP4G-E  switch intermittently does not "fixup" ARP reply packets for hosts it performs layer 2 translation on. This causes the IE4000 to forward ARP reply packet from a layer 2 translated host that have been "fixup" by l2nat (which is expected) and not.  You can observe this behavior by taking a packet capture on the uplink of the IE4000 and observing both translated and non-translated ARP reply packets from the same host; only translated ARP reply packets should be observed.

Conditions:
configure l2nat on the IE4000 switch.

configure l2nat on the IE4000 switch for hosts that have a 1 second arp timeout.
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