Which two statements about import and export route control in an ACI fabric are true? (Choose two.)
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A. B. C. D.Explanation.
Sure, I'd be happy to explain import and export route control in an ACI fabric in detail.
ACI (Application Centric Infrastructure) is a software-defined networking solution that provides centralized automation and management of physical and virtual networks. It uses a policy-driven approach to network provisioning, which allows administrators to define policies for application deployment and network connectivity.
In ACI, import and export route control refers to the ability to control the routes that are learned and advertised by the ACI fabric. This is important because it allows administrators to control the flow of traffic in and out of the fabric, and to ensure that only authorized routes are used.
Import Route Control: Import route control allows administrators to control which routes are learned by the ACI fabric. This is done through the use of route maps, which are applied to the interfaces on the ACI fabric. Route maps are used to filter routes based on various criteria such as prefix, origin, and AS path.
The following are true about import route control in an ACI fabric:
A. Prefixes learned from BGP L3outs cannot be filtered inbound: This statement is true. BGP L3outs are external connections to the ACI fabric, and the routes learned through these connections cannot be filtered inbound.
B. Prefixes learned from OSPF/EIGRP are never permitted inbound by default: This statement is false. By default, all OSPF and EIGRP routes are permitted inbound.
C. Prefixes permitted inbound are redistributed into MP-BGP at the ingress leaf: This statement is true. Once a route is permitted inbound, it is redistributed into MP-BGP (Multiprotocol BGP) at the ingress leaf.
Export Route Control: Export route control allows administrators to control which routes are advertised by the ACI fabric. This is done through the use of export route control policies, which are applied to the EPGs (Endpoint Groups) on the ACI fabric. Export route control policies are used to filter routes based on various criteria such as prefix, origin, and AS path.
The following are true about export route control in an ACI fabric:
D. Export route control controls if the prefixes are redistributed from MP-BGP at the egress leaf: This statement is true. Export route control policies control which prefixes are advertised by the ACI fabric, and this is done at the egress leaf.
In summary, import and export route control are important features of an ACI fabric that allow administrators to control the flow of traffic in and out of the fabric. Import route control is used to filter the routes learned by the ACI fabric, while export route control is used to control which routes are advertised by the fabric.