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diagram {
span_width = 40;
os-admin [label="Openstack Admin",color="lightgray"];
tenant [label="Openstack Tenant X",color="lightblue"];
api [label="Neutron BGPVPN API",color="red"];
driver [label="BGPVPN Driver for\nbackend Foo",color="red"];
backend [label="BGPVPN Backend Foo\n",color="orange"];
bgppeers [label="BGP Peers",color="green"];
backend --> bgppeers[label="BGP peerings",color=green];
backend <-- bgppeers[rightnote="BGP sessions live in parallel\nto BGPVPN service plugin",color=green];
os-admin -> api [label="POST: create a BGP VPN\nresource corresponding to a\nBGP VPN",color=blue];
api -> driver [leftnote="persist resource"];
driver --> backend [label="(driver-backend exchanges\nvarying bw. backends)"];
driver <-- backend;
api <-- driver;
os-admin <-- api [label="BGPVPN Y",color=blue];
os-admin -> api [label="UPDATE: set tenant X as\nowner of BGPVPN Y",color=blue];
api -> driver;
driver --> backend [label="(?)"];
driver <-- backend;
api <-- driver;
os-admin <-- api;
tenant -> api [label="GET:Learns that it\nowns BGPVPN Y",color=blue];
api -> driver;
driver --> backend [label="(?)"];
driver <-- backend;
api <-- driver;
tenant <-- api;
tenant -> api [label="UPDATE:Associate BGPVPN Y to\nnetwork Z",color=blue];
api -> driver;
driver -> backend [rightnote="now ready to interconnect\nNetwork Z and BGPVPN Y"];
driver <-- backend;
backend -> bgppeers[label="MP-BGP VPNv4 routes\ntoward Network Z exported\nto BGP VPN Y",color=green];
backend <-- bgppeers[label="MP-BGP VPNv4 routes\nfrom BGP VPN Y prefixes",
leftnote="forwarding plane setup\n(e.g. MPLS/GRE)",color=green];
api <-- driver;
}
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