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    Underlay Network Design with Contrail Cloud

    Figure 1 provides a general guidance of what the underlay network fabric design looks like in a spine-and-leaf topology in order to cater to the cluster build-out as described in Cluster Design Overview.

    As a requirement for RHOS, the RHOS Platform controller hosts must be on the same subnet, and thereby all controller hosts must be on the same rack in an Layer 3 Clos fabric underlay design.

    Juniper recommends running the spine-and-leaf topology in a simple Open Shortest Path First (OSPF) area 0 Layer 3 Clos fabric design. The MX480 SDN gateways are connected separately to an additional top-of-rack (ToRs) leaf. This is similar to the Contrail Cloud Reference Architecture (CCRA) 1.0 underlay design.

    Note: Due to limitations with Red Hat OpenStack Director (RHOSP 10) provisioning constructs, the Layer 3 Clos fabric underlay design is not supported. The multi-rack design is available only on Layer 2 fabric architecture.

    Figure 1: Underlay Network Fabric

    Underlay Network Fabric

    Modified: 2017-12-12