Symptom

Leaf sends ARP request to random ECMP nexthop when no endpoint entry of nexthop. This cause packet loss until Leaf sends ARP to correct nexthop. e.g. Nexthop 10.0.71.23 is chosen for 10.0.70.0/24 in this case, Leaf sends ARP request to 10.0.71.21 or 10.0.71.22 or 10.0.71.23 when a packet for 10.0.70.0/24 is coming from front port and no endpoint entry of nexthop 10.0.71.23. leaf11# show ip route vrf m1:v99 IP Route Table for VRF "m1:v99" '*' denotes best ucast next-hop '**' denotes best mcast next-hop '[x/y]' denotes [preference/metric] '%' in via output denotes VRF 10.0.70.0/24, ubest/mbest: 3/0 *via 10.0.71.21, vlan20, [1/0], 00:10:39, static *via 10.0.71.22, vlan20, [1/0], 00:10:32, static *via 10.0.71.23, vlan20, [1/0], 00:10:30, static

Conditions

ECMP paths in L3Out

Workaround

Enable IP SLA tracker for al NHs or run BFD on Static-route

Further Problem Description