Blog Entries

BGP With a Service Provider

So you want to peer with a service provider. Never done it before? Overwhelmed? Don’t know where to start? If this sounds familiar, then this article is for you!
We’re going to have a look at the process of peering with an ISP. We’re not going to look too deeply into the technical details. Rather, we’ll focus more on the process.

vPC and LAG Convergence

A new Nexus release brings two new features, called vPC Fast Convergence and LACP Convergence.
There wasn’t a lot of information readily available, so I’m going to share what I’ve learned here. I’d like to take a moment to thank Amith Ronad from Cisco for helping me to understand these features.

Hitless vPC Role Change

There has always been a primary and secondary role in a vPC relationship. But, they’ve always been non-preemptive. That means that a secondary will not automatically become primary unless there’s a failure of some sort.

Planning a Move to the Data Centre?

If you’ve never worked in a third-party data centre before, the first time can be a bit of a shock. There are a lot of rules and procedures to follow, and each data centre is a bit different from the last one.

Dynamic Routing and FEX

A few weeks ago I was working on a customer’s network when I found an OSPF problem. For some reason, an ASA wouldn’t peer with a Nexus switch. To make it a bit weirder, the problem only happened on the default VRF, and only with OSPFv3. On the Nexus side, I could see the ASA neighbour, but it was stuck in INIT. On the ASA side, I couldn’t see the neighbour at all.