In the VXLAN-EVPN scenario with ERB (Edge Routed Bridging) where the QFX10K is used as the SPINE and QFX5110 is used as the LEAF device. In the above scenario if the L3 traffic is routed from the SPINE towards the LEAF1 and the L3 traffic is destined to go to another LEAF2 via the VXLAN tunnel (using vtep interface) then this will not work.

Traffic flow:

CE1--------QFX10K---------LEAF1(QFX5110)======VXLAN-TUNNEL=======LEAF2(QFX5110)-------CE2

Ping from CE1 to CE2 or CE2 to CE1 will fail.

Traffic can be seen going out on the vtep interface from LEAF1 to LEAF2 but the L3 packets are never forwarded towards CE2 and it gets dropped on the ingress of LEAF2.

The routing between the pure L3 interface and VXLAN interface is not supported on the QFX5110 platform. This is a product limitation.

However if we create an IRB instead of the L3 interface then the given scenario can be achieved.

For more information please refer the following link

https://www.juniper.net/documentation/us/en/software/junos/evpn/topics/concept/evpn-vxlan-qfx5110-l2-vxlan-l3-logical.html

Note: This feature is actually supported after 20.1 code on QFX5120 platform and EX4650 platform.