Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

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

Table 1 lists the deployment architecture specifications.

Table 1: Deployment Architecture Specifications

Role

Model

Quantity (1 Rack)

Quantity (Additional Rack)

Leaf TOR Switches

Basic Network Fabric

QFX5100-48S

2

2

Advanced Network Fabric

QFX5100-48S

4

4

SmartNIC

QFX5200-32C

2

2

Spine Switches

Basic Network Fabric

QFX10002-72Q

2

2 for every 18 racks

Advanced Network Fabric

QFX10002-72Q

4

4 for every 36 racks

Gateway Router

MX480

2

-

Management Switch

EX4300-48T

2

2