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Clearly it is not desirable to span L2 broadcast domains over the WAN nor is it desirable to span L2 domains between edge sites. Thus the networking architecture allows for deployment using local isolated L2 domains at each edge site as well as support for IP connectivity only across the WAN.

Layer 2 Architecture

Rover

Unicycle with SR-IOV datapath

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Unicycle with OVS-DPDK datapath

LAG Considerations

The RC (when installed on bare metal, Rover and Unicycle Genesis nodes boot via their VLAN tagged 'host' interfaces which are pre-provisioned on the serving TOR switches with LAG bonding. Since booting occurs before the linux kernel can bring up its LAC-P signaling the TOR switches must be configured to pass traffic on their primary (first) link before the LAG bundle is up.

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