Describes the process by which routes learned from OSPF processes on border leaves are redistributed into BGP for tenant VRFs in ACI environments.
ACI route redistribution is a routing mechanism that
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redistributes routes learned from OSPF processes on border leaves into BGP for tenant VRFs
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imports these routes into MP-BGP on the border leaf, and
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controls route advertisement through export route control policies.
Route control support
ACI provides different levels of route control support for various routing protocols:
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Import route control: Supported for BGP and OSPF, but not for EIGRP
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Export route control: Supported for OSPF, BGP, and EIGRP
Routes are learned on the border leaf where the VRF is deployed. The routes are not advertised to the External Layer 3 Outside connection unless it is permitted by the export route control.
When a subnet for a bridge domain/EPG is set to Advertise Externally, the subnet is programmed as a static route on a border leaf. When the static route is advertised, it is redistributed into the EPG's Layer 3 outside network routing protocol as an external network, not injected directly into the routing protocol.
