Tungsten Fabric traffic flow

This section describes the types of traffic and traffic flow directions in a Mirantis OpenStack for Kubernetes (MOSK) cluster.

User interface and API traffic

The following diagram illustrates all types of UI and API traffic in a Mirantis OpenStack for Kubernetes cluster, including the monitoring and OpenStack API traffic. The OpenStack Dashboard pod hosts Horizon and acts as a proxy for all other types of traffic. TLS termination is also performed for this type of traffic.


SDN traffic

SDN or Tungsten Fabric traffic goes through the overlay Data network and processes east-west and north-south traffic for applications that run in a MOSK cluster. This network segment typically contains tenant networks as separate MPLS-over-GRE and MPLS-over-UDP tunnels. The traffic load depends on the workload.

The control traffic between the Tungsten Fabric controllers, edge routers, and vRouters uses the XMPP with TLS and iBGP protocols. Both protocols produce low traffic that does not affect MPLS over GRE and MPLS over UDP traffic. However, this traffic is critical and must be reliably delivered. Mirantis recommends configuring higher QoS for this type of traffic.

The following diagram displays both MPLS over GRE/MPLS over UDP and iBGP and XMPP traffic examples in a MOSK cluster: