![]() ![]() This domain itself is configured via Fabric Access Policies.Ī. Select a 元Out Domain to define which range of VLANs and interfaces the 元Out configurations are allowed to use. Select a VRF to deploy the routing protocolĬ. Select a routing protocol to deploy (such as OSPF or BGP)ī. The following steps are the summary to deploy a routing protocol on an ACI border leaf with the components shown in Figure 4.Ī. The basic com ponents of 元Out in GUI (APIC 3.2 Release) Allow traffic to arrive from or be sent to external networks via 元Out by using a contract Advertise learned external routes to other 元Outs (Transit Routing)ĥ. Advertise ACI internal routes (BD subnets) to outside ACIĤ. Distribute learned external routes (or static routes) to other leaf switchesģ. Learn external routes via routing protocols (or static routes)Ģ. ![]() The 元Out provides the necessary configuration objects for five key functions:ġ. Please refer to the “ 元Out and regular endpoints” section in the “ACI Fabric Endpoint Learning” white paper for this as well. Hence, connecting a network device that contains multiple subnets behind it to ACI via a BD/EPG will end up with an endpoint that has a huge number of /32-IP-addresses, which is not efficient and will likely hit a scalability limit. In ACI BD/EPG, every IP address is learned as an endpoint with /32 (or /128 for IPv6). 元Out, essentially, connects a network device that has other subnets behind it. The ACI Layer 3 Out (元Out) was initially designed only as a border between the stub network formed by ACI and the rest of the network, such as intranet, Internet, WAN, etc., not as a transit network. Another one is the Layer 3 Out (元Out, or external routed network in Cisco APIC GUI prior to the APIC Release 4.2), which is to provide Layer 3 (元) connectivity between servers connected to ACI and other network domains outside of the ACI fabric through routing protocol or static route.Ĭisco ACI was originally built to be a stub network in a data center to manage endpoints. Some of these components include bridge domains (BDs) and endpoint groups (EPGs) to provide Layer (L2) connectivity or default gateway functions for a group of endpoints. The ACI fabric is formed from multiple components. Hence, the recommendation is to read this document with some basic understanding of ACI along with decent knowledge of standard routing protocols such as OSPF, EIGRP, BGP and MP-BGP. ![]() Instead, its focus is on understanding the key concepts. This document does not provide step-by-step configuration examples for all scenarios. The goal of this document is to explain thoroughly Cisco ACI design concepts and options related to the ACI 元Out. The Layer 3 Out (元Out) in Cisco Application Centric Infrastructure (Cisco ACI) is the set of configurations that define connectivity to outside of ACI via routing. Advanced configuration 4 (Shared 元Out with unintended leak).Advanced configuration 3 (Shared 元Out with multiple VRF/元Outs).Advanced configuration 2 (Shared 元Out with multiple VRF/BDs).Advanced configuration 1 (元Out EPG separation).Advanced shared 元Out configuration options.元Out shared service (VRF route leaking).default-export for simple routing control (the recommended configuration). ![]() Route Profile Type and 元Out EPG/subnet.Route Profile on 元Out EPG (export/import routes).An exception for a directly connected subnet with 0.0.0.0/0.An exception for 0.0.0.0/0 with External Subnets for the External EPG.External Subnets for the External EPG and prefix – pcTag mapping.Internal route-map for BD subnet advertisement.EIGRP protocol options – interface level.OSPF protocol options – interface level.BGP protocol options – 元Out/node level.IP SLA tracking for 元Out static routes.Advertise external routes to other external devices (Transit Routing) Advertise internal routes (BD subnets) to external devices Distribute external routes within the ACI fabric Learn external routes on border leaf switches ![]()
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