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
We covered authenticating against the Cisco ACI APIC controller using cURL a while back… and that’s pretty useful when you need to integrate with some quick-and-dirty shell scripts. However, many people like Python for systems programming these days as it provides more advanced data structures and a wealth of libraries to enhance your code. We’re … More APIC Authentication with Python
You’ve probably read through our ACI Best Practices Configuration post. If you haven’t , please do so now. Go ahead, I’ll wait. (Are you done clicking those buttons in the GUI yet? Take your time. I won’t leave you, but I may nip out for a quick coffee while I wait). All done? Welcome back! If you’re … More ACI Best Practices Configurations for Curling
When you’re using curl to interact with the APIC API, or even if you’re using a toolkit/library to create applications, you may want to know which APIC API methods and objects are available for a given task. Yeah, yeah. RTFM. You know what’s up. You’ve already done that. You’ve read the Cisco APIC REST API … More Getting Cozy with the APIC API
If you’ve spent any time with the ACI interface, you’ve probably realized that herding a mouse around a browser is fine for small/one-time operations, but does not scale when you have a large quantity of repetitive operations. Maybe you started using Postman to run API queries, but you want to build a succession of queries and roll … More Getting Started With Curl
Now that 4.0 is released, it’s time to start planning your upgrade! So get out your pencils and slide rules, and start blocking off your calendar for maintenance windows for the next three months… Just kidding! With ACI, upgrading is simply one of those casual tasks you do between coffee breaks or network outages. And … More Upgrading ACI Fabric: The 4.0 Way.
I’d like to thank Takuya Kishida for his work on this post! Common Pervasive Gateway is an older feature that was used to connect multiple ACI fabrics together via a L2 connection prior to the availability of ACI MultiPod and ACI MultiSite. While most customers will use a newer feature such as ACI MultiPod, or … More ACI Common Pervasive Gateway
The top question all new ACI customers have (or should have), is what are the configurations that should be enabled on my fabric from the beginning? With that in mind, we’re going use this post as a living document with configurations that are considered “Best Practice” to have enabled. We will keep this document updated … More ACI Best Practice Configurations
There are certain times when CIMC access to your APIC is absolutely critical, for example, when you are troubleshooting a problem, upgrading your APICs, or performing a factory reset. During these times, you can access your APIC via CIMC by using the KVM console, which requires Java (or HTTP with CIMC 3.0), or by enabling … More Upgrading the CIMC for your APICs