Understanding Scope Of Prefixes in L3 Out External EPG in ACI

In ACI the external Routing Peer to the router is done through border leaves with a object called L3Out.   L3Out has an object in it called the L3Out InstP also known as the External EPG.    In the External EPG you can put in Prefixes and choose the scope based on your intended goal.   Under the … More Understanding Scope Of Prefixes in L3 Out External EPG in ACI

STP and ACI: Intermittent packet loss due to TCNs

One issue that can arise when we connect ACI and Legacy STP environments is intermittent packet loss to ACI endpoints due to Spanning-tree TCNs. TCNs will trigger ACI to flush endpoints in the EPG on which the TCN was received. ACI does re-learn the endpoints based on normal data-plane learning, but if the TCNs are … More STP and ACI: Intermittent packet loss due to TCNs

ACI Multi-Pod Caveats and Considerations

  Originally I was going to create a detailed configuration guide for Multi-Pod, however, after checking out the the Cisco ACI MultiPod Configuration Whitepaper on CCO I realized I would be duplicating efforts at best. The configuration whitepaper on CCO contains detailed configuration examples for the IPN and screenshots from the APIC. If you are … More ACI Multi-Pod Caveats and Considerations

ACI Multi-Pod QOS

I’d like to thank Soumitra Mukherji for his work on this post! When configuring MultiPod, a frequently asked question that often comes up is how to configure QOS between the ACI Fabric and the IPN network, to ensure that critical ACI fabric traffic is not dropped. With this article, we will go through configuration examples of … More ACI Multi-Pod QOS

ACI: vPC in ACI

Prerequisites While there are no prerequisites, if you need a refresher on Fabric Access Policy Configurations inside of ACI (i.e., AAEP, Switch Profiles, Interface Profiles, Vlan Pools, Policy Groups), check out this post, Configuring Fabric Access Policies. vPC Overview A virtual port channel (vPC) allows links that are physically connected to two different ACI Leaf … More ACI: vPC in ACI

Deploying a Tenant across two-sites using the Multi-Site Controller in 3 easy steps

I’d like to thank Soumitra Mukherji for his work on this post! As of this posting, January 2018, Multipod for ACI has taken off and seen a good amount of field exposure amongst Cisco ACI customers.  There have been a number of customers who were going to deploy either dual ACI Fabrics or  Stretched ACI … More Deploying a Tenant across two-sites using the Multi-Site Controller in 3 easy steps

Transit Routing Use case – EIGRP with routed interfaces

Beginning with APIC code 1.1, Cisco introduced the ability to allow routes to “Transit” the fabric. Prior to this release, the ACI Fabric was only seen as a collection of “stub” networks, meaning that the ACI Fabric would only advertise Bridge Domain subnets; it would not advertise routes received from an external routing peer to … More Transit Routing Use case – EIGRP with routed interfaces