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 L3Out External EPG in ACI
Are you using MSO (ACI Multisite Orchestrator), in standalone mode ? Well, please do not do that in production. Often times in a lab environment you will be tempted to do this. I’m guilty of doing this myself on the Cisco ACI Advanced Bootcamp ACI training labs, simply because I’m too lazy to bring … More Cisco MSO Standalone Upgrade
The mere mention of that word starts an immediate flurry of word association. Things like “broadcast storm”, “loops”, and “outage” spring to mind, all the while palms get sweaty reminiscing the memories of bridge calls with angry and impatient end users. To be honest, the Spanning-tree protocol gets a bad wrap. Its whole purpose is … More Spanning-tree (STP) and ACI
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
UPDATE – The Common Pervasive Gateway feature has been deprecated and is not actively maintained anymore. When operating more than one Cisco ACI fabric, we highly recommend that you deploy Multi-Site instead of interconnecting multiple individual ACI fabrics to each other through leaf switches using the Common Pervasive Gateway feature. The Common Pervasive Gateway feature … More ACI Common Pervasive Gateway
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 looking … More ACI Multi-Pod Caveats and Considerations
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
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
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
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