I've been following this blog post: https://vincent.bernat.im/en/blog/2017-vxlan-bgp-evpn, using frr 3.1dev from git master from several nights ago. I believe I have the route reflector + vteps configured with respect to bgpd as described, but no routes are advertised. I do see bgp neighbors as expected.

When I run 'show evpn mac vni 100', I do not see any mac addresses. My suspicion is that it is because I'm not using a bridge, but assigning an IP address directly to the vxlan interface. Looking at the source code (my C is very rusty), it looks like it enumerates all the VNIs, finds the bridges they're slaved to, then enumerates the interfaces on the bridge. I'm looking at this: https://github.com/FRRouting/frr/blob/8eac4812601f069f14fc7950e10904c2ae0ae774/zebra/zebra_vxlan.c#L2668

Is there a way to configure my interfaces without a bridge (or is this a bad approach)? If a bridge and additional slaved interface is required, any suggestions on how to configure the bridge with no additional tenants on the servers?

Additional Thoughts: 

- using static unicast discovery, vxlan membership across servers works

- adding a bridge interface and slaving the vxlan interface + a dummy interface, assigning an ip to the dummy did not seem to work

- tried kernel 4.4 from elrepo, (tends to work better from previous docker overlay network experiences)

Config:

compiled from commit c1240044fbf081bb7407b1449d3954e4b63fec9f on CentOS 7.4, with --enable-cumulus

Route Reflector:

bgpd.conf:

layer-2 member server example:

bgpd.conf:

vxlan configured with:

# ip link vxlan100 type vxlan id 100 local 10.40.1.129 port 4789 nolearning

# ip link set up dev vxlan100

# ip addr add 172.31.254.2/24 dev vxlan100

Thanks for any suggestions (or course corrections, as this is new to me)!