Category Archives: Data Centre

Configuring Link Speed on UCS 6545 10/25G ports

The secret is to double-click on the port to bring up the Properties window. From here you find the Show Interface option. Continue reading

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

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

RedNectar’s HX Pre-Install Checklist

…has been updated and is found here: https://rednectar.net/2018/10/06/rednectars-hyperflex-pre-install-checklist-updated/

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ISIS, COOP, BGP and MP-BGP in Cisco ACI

Let me start with a picture.  Imagine a simple 2leaf/2spine topology with HostA attached to to Leaf1 and with HostB attached to to Leaf2. Enter IS-IS. The leaves and spines will exchange IS-IS routing updates with each other so that Leaf1 sees that it has two equally good paths to reach Leaf2, and Leaf2 sees that it has two equally good paths to reach Leaf1. Now think about the hosts. This is where COOP comes in. BGP is not needed until an external router is connected. Continue reading

Posted in ACI, ACI configuration, APIC, Cisco, Data Center, Data Centre, EPG, L3 Out, L3out | Tagged , ,

Non overlapping VTEP IP addresses in Cisco ACI

Cisco recommends that “The TEP IP address pool should not overlap with existing IP address pools that may be in use by the servers (in particular, by virtualized servers).”
Let me tell you a reason much closer to reality why you might want to avoid overlapping your Cisco ACI TEP addresses with your locally configured addressing scheme. Continue reading

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Cisco ACI Naming Standards

Have you ever wondered what a L3 Out object is, when there no facility to create an object called L3 Out? I managed to solve this and many other ambiguities by developing and adopting a consistent naming standard. Continue reading

Posted in Access Policies, ACI, ACI configuration, Cisco, Data Center, Data Centre, Nexus, Nexus 9000, SDN, Software Defined Networking | Tagged , , , , | 1 Comment

A funny thing happened in the ACI lab today…

I had a Tenant with a statically configured bare metal hosts attached to interface 1/16 on both leaf 101 and leaf 102, but came up with a “invalid-path;invalid-vlan” error on the faults page for the EPG that was being configured … Continue reading

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