digraph G {
    node [ shape=rect ];

    label="Data Center Light networking/routing (2021-04-11)"

    {router1p5,router2p5}->sunrise;

    sunrise->igp [ label="Add sunrise on-link routes" ]
    netstream->igp [ label="Add netstream on-link routes" ]
    vpnserver->routers [ label="eBGP: Announce /40's (reprop)" ]

    apurouters->routers [ label="Announce (internal) /64's" ]
    apurouters->igp [ label="Announce internal on-link routes (these
    are /64's" ]

    k8s->apurouters [ label="Announce /122, /128 routes (iBGP/eBGP)" ]

    something->switches [ label="Re-Announce k8s routes for ECMP" ]

    # Questions:
    # Do VPN servers import routes? Probably not, can use default route
    # Do APU routers import routes? Yes from k8s
    # Do APU routers import routes from routers? Maybe.
    # Maybe not: can have default route to routers
    # Maybe yes: to learn k8s routes
    # Will announce k8s routes via eBGP, nexthop reset. not what we want

    # Can we use iBGP + separate table instead of ospf/babel?

    ######################################################################
    # Switch interaction
    # Either OSPF or BGP
    #
    # Primary objective: ecmp routes for k8s nodes / pods
    # Secondary objective (maybe) routing for the switch
    #
    # BGP: f.i. connecting to a route reflector; or routes come in via
    # eBGP
    # BGP / maybe RR seems a bit more native
    # OSPF: MTU mismatch showing, automatic join, only internal routes

    ######################################################################
    #
    #


    ######################################################################
    # k8s
    # k8s systems could in theory peer with switches -> security
    # design not so eay
    #
    # k8s systems could peer with routers (multihop, iBGP)
    #
    # k8s systems could peer with apu-routers (direct, iBGP)
    # apu-routers would need to become route-reflector towards routers
    #
    # k8s systems could peer with apu-routers (direct, eBGP)
    #
    # routers can re-export to APUs as route reflectors

    # How do the routers reach k8s system? Need route from apu routers
    # probably via igb


}