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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 site specific input yaml files documented in the Unicycle Deployment section of the release 1 documentation contain examples from the validations lab deployments of the 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.
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