Also, the bug still present, fix for which I sent above in diff
vyos@r5-1.3-myb# compare
[edit interfaces]
+vxlan vxlan0 {
+ mtu 1430
+ remote fe80::2
+ source-address fe80::3
+ source-interface eth0
+ vni 0
+}
[edit]
vyos@r5-1.3-myb# commit
WARNING: RFC7348 recommends VXLAN tunnels preserve a 1500 byte MTU