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Two options exist to implement the route exchange for calico pods
(1) Using an external fabric BGP router and peering the calico pods to this router using eBGP, or
(2) Using the more traditional full iBGP mesh between all calico pods
Validation has been performed using the external fabric router approach.
In this case the external fabric router need to eBGP peer with all calico pods. To do this dynamic BGP peering is defined in the fabric router to accept BGP connection requests from any BGP speaker with an IP address from the calico 'ksn' network.
The input yaml files documented in the Unicycle Deployment section of the release 1 documentation contain the BGP related information required to force the calico pods to peer using eBGP such as own ASN and the external ASN of the fabric BGP router.