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OPERATIONAL DEFECT DATABASE
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- In a setup with 2x vPC Leaf pair, one vPC Leaf pair -- Active FW in Pod1, 2nd vPC pair--Stdby FW in Pod2. The Pod1--Active FW uses L3out with secondary IP, a similar message can appear: "2021-04-17 12:01:55 Local7.Critical 10.41.0.63 Apr 17 12:01:55.653 Leaf1061 %LOG_LOCAL7-2-SYSTEM_MSG [E4204936][transition][critical][sys] %ARP-2-DUP_SRC_IP: arp [19601] Source address of packet received from 0022.bdf8.19ff on Vlan43(Tunnel59) is duplicate of local, 10.7.2.1" 1. When the interface comes up it sends a GARP for its IP's (primary and secondary). The GARP would be forwarded out the front panel ports that are a part of the deployed interface profile as well as being forwarded into the fabric on the external BD VNID. 2. The other leaves with the secondary IP would receive this GARP coming from the fabric and detect a duplicate IP. 3. In ACI when a duplicate IP is detected the switch will wait for some time and then send its own GARP indicating it still has that IP address. The other leaf that originated the first GARP will get this response GARP and detect a duplicate. 4. It will send another GARP to continue. This process repeats itself indefinitely.
Same as in CSCvy34087 i.e. 1) Version check <15.2(4d) 2) Check var/sysmgr/tmp_logs/svc_ifc_techsup_nxos.tar/show_tech_info/show-tech-sup-output.gz for output of the command `show ip arp internal event-history event`; If there is a statement like "Duplicate address detected. Sending gratuitous-arp request after 60 seconds to notify others on the interface." from 2 different VLAN IDs, then it's a hit. This is only a case for non-vPC/Single Pod Topology or vPC/Multi Pod Topology. For vPC/Single Pod Topology, this is affected by CSCvy34087.
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Logic: 1 and 2 Snippet Format: [1] Version is <15.2(4d) [2] var/sysmgr/tmp_logs/svc_ifc_techsup_nxos.tar/show_tech_info/show-tech-sup-output.gz (We have multiple row from multiple VLANs such as VLAN10 and VLAN11) [Fri Oct 22 09:52:27 2021]:`show ip arp internal event-history event ` 215) Event:E_DEBUG_DSF, length:230, at 2021-10-22T09:52:07.682263000+02:00 [116] TID 24265:arp_process_receive_packet_msg:8087: log_collect_arp_pkt; sip = 10.235.26.33; interface = Vlan10;info = Duplicate address detected. Sending gratuitous-arp request after 60 seconds to notify others on the interface. 1154) Event:E_DEBUG_DSF, length:230, at 2021-10-22T09:50:44.506374000+02:00 [116] TID 24265:arp_process_receive_packet_msg:8087: log_collect_arp_pkt; sip = 10.235.26.49; interface = Vlan11;info = Duplicate address detected. Sending gratuitous-arp request after 60 seconds to notify others on the interface. 1797) Event:E_DEBUG_DSF, length:230, at 2021-10-22T09:49:45.954145000+02:00 [116] TID 24265:arp_process_receive_packet_msg:8087: log_collect_arp_pkt; sip = 10.235.26.33; interface = Vlan10;info = Duplicate address detected. Sending gratuitous-arp request after 60 seconds to notify others on the interface. 2375) Event:E_DEBUG_DSF, length:230, at 2021-10-22T09:48:42.714361000+02:00 [116] TID 24265:arp_process_receive_packet_msg:8087: log_collect_arp_pkt; sip = 10.235.26.49; interface = Vlan11;info = Duplicate address detected. Sending gratuitous-arp request after 60 seconds to notify others on the interface.