Packets to the host gets dropped on QFX when the destination MAC address is same as Chassis/Switch MAC. This article explains why this this behavior is expected.
Test for one of the scenarios:
lab@test> show interfaces irb Physical interface: irb, Enabled, Physical link is Up Interface index: 660, SNMP ifIndex: 502 Type: Ethernet, Link-level type: Ethernet, MTU: 1514 Device flags : Present Running Interface flags: SNMP-Traps Link type : Full-Duplex Link flags : None Current address: dc:38:e1:58:a6:c0, Hardware address: dc:38:e1:58:a6:c0 <--- Chassis MAC address Last flapped : Never Input packets : 0 Output packets: 0 lab@test> show ovsdb mac logical-switch Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c Logical Switch Name: Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c Mac IP Encapsulation Vtep Address Address Address ff:ff:ff:ff:ff:ff 0.0.0.0 Vxlan over Ipv4 10.84.51.71 00:22:22:00:00:15 0.0.0.0 Vxlan over Ipv4 10.84.51.71 00:66:66:00:00:16 0.0.0.0 Vxlan over Ipv4 10.84.51.71 dc:38:e1:58:a6:c0 0.0.0.0 Vxlan over Ipv4 10.84.51.71 <---Server MAC Address ff:ff:ff:ff:ff:ff 0.0.0.0 Vxlan over Ipv4 10.84.50.5
This is an expected behavior. The switch will drop the packet. Since the packet comes with DMAC, the same as IRB MAC, then the packet will be queued for L3 lookup which in turn will fail and gets dropped. The packet with IRB DMAC coming on any port is treated as MYMAC and L3 lookup is enabled for that packet. If the port has L2 configuration, L3 lookup is disabled for it. Hence, packet gets dropped with no startpc found. If the port has L3/IRB configuration, L3 lookup is done. If there is no route, then it gets dropped, else it will be forwarded. Example:
lab@test> show interfaces irb Physical interface: irb, Enabled, Physical link is Up Interface index: 660, SNMP ifIndex: 502 Type: Ethernet, Link-level type: Ethernet, MTU: 1514 Device flags : Present Running Interface flags: SNMP-Traps Link type : Full-Duplex Link flags : None Current address: dc:38:e1:58:a6:c0, Hardware address: dc:38:e1:58:a6:c0 Last flapped : Never Input packets : 0 Output packets: 0 lab@test> show ovsdb mac logical-switch Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c Logical Switch Name: Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c Mac IP Encapsulation Vtep Address Address Address ff:ff:ff:ff:ff:ff 0.0.0.0 Vxlan over Ipv4 10.84.51.71 00:22:22:00:00:15 0.0.0.0 Vxlan over Ipv4 10.84.51.71 00:66:66:00:00:16 0.0.0.0 Vxlan over Ipv4 10.84.51.71 dc:38:e1:58:a6:c0 0.0.0.0 Vxlan over Ipv4 10.84.51.71 ff:ff:ff:ff:ff:ff 0.0.0.0 Vxlan over Ipv4 10.84.50.5 lab@test> show ethernet-switching table vlan-name Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c MAC flags (S - static MAC, D - dynamic MAC, L - locally learned, P - Persistent static SE - statistics enabled, NM - non configured MAC, R - remote PE MAC, O - ovsdb MAC) Ethernet switching table : 3 entries, 3 learned Routing instance : default-switch Vlan MAC MAC Age Logical name address flags interface Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c 00:22:22:00:00:15 D - ae2.15 Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c 00:66:66:00:00:16 D - ae0.16 Contrail-4d917b6b-d64c-446c-8b30-736b7c73192c dc:38:e1:58:a6:c0 D - ae0.15 root@test:0% cprod -A fpc0 -c 'set dc bc "show c"' | grep RD RDBGC0.xe2 : 3,974,969 +5 2/s lab@test> show interfaces terse Interface Admin Link Proto Local Remote ge-0/0/0 up up ge-0/0/0.15 up up aenet --> ae0.15 ge-0/0/0.16 up up aenet --> ae0.16 ge-0/0/0.32767 up up aenet --> ae0.32767 gr-0/0/0 up up pfe-0/0/0 up up pfe-0/0/0.16383 up up inet inet6 pfh-0/0/0 up up pfh-0/0/0.16383 up up inet ge-0/0/2 up up ge-0/0/2.10 up up aenet --> ae2.10 ge-0/0/2.11 up up aenet --> ae2.11 ge-0/0/2.15 up up aenet --> ae2.15 ge-0/0/2.20 up up aenet --> ae2.20