Author Archives: RedNectar Chris Welsh

About RedNectar Chris Welsh

Professional IT Instructor. All things TCP/IP, Cisco or Data Centre

ACI Inband Mangagment Route Leaking Kludge

Posted on 2019/12/01

When I was challenged with this: Hi @RedNectar , Right now I have a simple contract that allows SSH only: Scope set to global. TCP dst 22. “Both directions” and “reverse port filters” enabled. This contract is provided by the inband EPG … Continue reading →

Posted in ACI, aci inband management, ACI inband management tutorials, ACI Tutorial, Cisco | Tagged , , , | 2 Comments

Understanding Scope Of Prefixes in L3 Out External EPG in ACI —

Posted on 2019/11/09

Excellent post on unofficialaciguide – hightly recommended. 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 … Continue reading →

Quote | Posted on 2019/11/09

Validating IP Address Entries in Excel

Posted on 2019/07/15

You will learn how IP addresses and subnet mask validation is done, plus a few other IP address maniplating tricks in Excel. Continue reading →

Posted in GNS3 WorkBench | Tagged , , , , | 1 Comment

Seven things to know to make Hyperflex go – Cisco HyperFlex Best Practices

Posted on 2019/05/26

Creating a Datastore in Hyperflex Connect is easy, Creating a Datastore in vCenter is messy, When creating HXDP Snapshots in vCenter you need to be careful. There are some things that you need to do differently, and some you should do differently. Here are Seven things to know to make Hyperflex go. Continue reading →

Posted in Best Preactices, Cisco, Data Center, Data Centre, ESXi, Hyperflex, VMware | Tagged , , , | 2 Comments

MS Community Robot Finds Word Tables Offensive

Posted on 2018/12/04

I posted this question on the Micsoft Community board and in the course of the following discussion, I posted this picture of a MS Table with the Language incorrectly set. But suddenly, it was removed from my discussion.  Replaced by … Continue reading →

Posted in Microsoft, opinion, rant

RedNectar’s Hyperflex Pre-Install Checklist (Updated)

Posted on 2018/10/06

Completing Cisco’s Pre-installation Checklist for Cisco HX Data Platform will capture all the information you need, but not necessarily in the order you need it, and for a single site only. So, I decided to write a version that gets … Continue reading →

Posted in Cisco, Hyperflex, UCS, VLANs | Tagged | 1 Comment

Resolution Immediacy and Deployment Immediacy – ACI Master Class

Posted on 2018/08/17

When configuring ACI, have you ever wondered what those Resolution Immediacy options [Immediate | On Demand | Pre-provision] and the Deployment Immediacy options [Immediate | On Demand] do? Continue reading →

Posted in Access Policy Chain, ACI, ACI Tutorial, Cisco, Master Class, Nexus 9000 | Tagged , , ,

ARP Gleaning – ACI Master Class

Posted on 2018/08/13

The purpose of these Gleaning ARPs is simply to “tickle” the target station into sending a packet – not because the gateway needs the MAC address of the target! Continue reading →

Posted in ACI, ACI Tutorial, Cisco, Master Class | Tagged , , , | 7 Comments

An Epyc new addition to the UCS Family!

Posted on 2018/06/01

Originally posted on UCSguru.com:
? Back in February of this year, when I read an article in The Register, announcing that Raghu Nambiar, the then chief technology officer for UCS servers had joined AMD. I didn’t think too much of…

Posted in GNS3 WorkBench

Backup Plan

Posted on 2018/05/30

Found this in a hotel tonight. Always good to have a backup plan

Posted in GNS3 WorkBench | Tagged