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Contrail vRouter


Contrail vRouter is composed of the Contrail components on the compute node/host shown in Figure 1. For a compute node in the default Docker setup, containers on the same host communicate with each other, as well as with other containers and services hosted on the other host with a Docker bridge. In Contrail networking, on each compute node the vRouter creates a VRF table per virtual network, offering a long list of features.

From the perspective of the control plane, the Contrail vRouter:

  • Receives low-level configuration (routing instances and forwarding policy).

  • Exchanges routes.

  • Installs forwarding state into the forwarding plane.

  • Reports analytics (logs, statistics, and events).

From the prospective of the data plane, the Contrail vRouter:

  • Assigns received packets from the overlay network to a routing instance based on the MPLS label or Virtual Network Identifier (VNI).

  • Proxies DHCP, ARP, and DNS.

  • Applies forwarding policy for the first packet of each new flow then programs the action to the flow entry in the flow table of the forwarding plane.

  • Forwards the packetst after a destination address lookup (IP or MAC) in the Forwarding Information Base (FIB), encapsulating/decapsulating packets sent to or received from the overlay network.

Figure 1: Docker and Contrail vRouter
Docker and Contrail