Cisco Bug: CSCur20115 - Nexus 3500: ARP destined to peer's phy mac is dropped in non-vpc vlan
Feb 28, 2017
- Cisco Nexus 3000 Series Switches
- Cisco Nexus 3548 Switch
Known Affected Releases
Symptom: In the Nexus 3500 vPC setup, the switch drops ARP (reply) packets destined to the peer's physical MAC address. Example: Router1----vlan99----N3548A=======N3548B Router1 has IP address 10.10.10.1/24 N3548A has IP address 10.10.10.2/24 in vlan 99 N3548B has IP address 10.10.10.3/24 in vlan 99 N3548A and N3548B has peer-link, peer-keepalive and a port-channel to carry non-vpc vlans between them. Ping from N3548B to 10.10.10.1 fails, as ARP is INCOMPLETE. Conditions: This issue occurs when Nexus 3500 is running one of the affected releases AND The vPC peer-gateway is enabled It is also seen when "peer-gateway exclude-Vlan <x>" is configured. In other words, the issue happens for non-vPC VLAN only.
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Bug Details Include
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