Cisco Bug: CSCvw00075 - Unknown-Unicast ARP traffic being forwarded out of same ingress interface with PVLAN Configured
Oct 09, 2020
- Cisco Catalyst 9400 Series Switches
Known Affected Releases
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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Bug Details Include
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