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Cisco Bug: CSCvw00075 - Unknown-Unicast ARP traffic being forwarded out of same ingress interface with PVLAN Configured

Last Modified

Oct 09, 2020

Products (1)

  • Cisco Catalyst 9400 Series Switches

Known Affected Releases

17.3.1

Description (partial)

Symptom:
On PVLAN deployments, ARP response traffic is getting sent out of the same ingress interface where it was received.
When performing a Fed Punt/inject Capture we are able to see the ARP packet in both directions. It seems that the injected packet gets sent back out the ingress interface after a vlan rewrite.

Conditions:
* Device is running 17.3.1
* Seen on Cat9400
* Both ARP Snooping and Private Vlan must be Configured.
* There has to be at least 2 interfaces with at least 1 of them configured with PVLAN.
* Issue can be triggered with both a PVLAN Trunk or a PVLAN Access port.
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