Comment 2 for bug 2052485

This scenario works outside Devstack, so it may be that the topology with the Cumulus switch-router or something in Devstack itself is getting in the way. It would help to know your topology.

* What interfaces are on the Cumulus virtual switch (both IP interfaces and patches to bridges)?

* What are the IP addresses/subnets on those interfaces?

* What does the routing table look like on the Cumulus router? (“show ip route”, “show ip route 172.24.4.x”)

* What does the BGP table look like on the Cumulus switch?
vtysh “show bgp”, “show ip bgp”, “show ip bgp summary”, and “show ip bgp 172.24.4.x/32” for the individual VM IPs

* What do the neighbors look like? (“show ip bgp neighbors”)

* What do the routing tables look like on the VM hosts themselves?

* Does it help to turn on proxy-arp on the Cumulus switch on the interface(s) facing the VMs?