Troubleshooting a discrepancy between convergence time of different VRFs with identical settings, running over the same topology, I got the chance delve deeper into OSPF timers. Since it took a while to wrap my head around all the moving parts and I only fully grokked it after drawing everything on a whiteboard for a colleague, I decided to explain this thoroughly here.
This will be a bit of a long read. In short: If you don’t set your LSA accept timers lower than your LSA send timers, you will have to wait for your retransmission time-out get
I have recently started writing recipes for things that are on the CCIE blueprint. For more details, see the reference series page. This is a short recipe to configure etherchannels.
I attended Narbik Kocharians CCIE R&S bootcamp in Poland last week. I learned a lot and tried to write a little note-to-self every day. What good is a note-to-self, if you don’t read it afterwards.
The final day was just a short day, until noonish. Narbik explained some about redistribution and showed us some loops and how to fix them. It felt a bit rushed, but to be honest, I don’t how much more I could absorb. Afterwards, I tried to do some more troubleshooting labs, but I clearly want clear headed enough. So, I spent the final time chatting with my classmates.
Thanks everyone who was in this class with me. Especially Sylwia, David, Bernd, and Dan
Day 8 and 9
The tiredness is taking it’s toll now. I really notice that I have more difficulties with the troubleshooting labs. I didn’t even have the energy to write a post yesterday evening. I am noticing that I am less focussed on all the troubleshooting labs. A few of us are going through them at a really rapid pace. I could keep up for a while, but at the last lab today I just had to give up. I couldn’t even troubleshoot the simplest issues, let alone the ramped up difficulties.
Today, we started out with some of Narbiks troubleshooting labs. They are made to show you some quirky side of technology interactions. He really likes you to misuse technologies to work around a problem. Might come in handy as a workaround on the Lab.
No class today. It was a day of Mock labs. In the morning we did a diagnostics lab, after that a configuration lab that is said to be seriously difficult.
Day 4 Troubleshooting tired typos
The processes do work. It really is a go slow to go fast. Build the foundations first, make sure everything is correct before moving on to anything dependant on the foundations. This makes problem domains small in your head and more easily solved. It is still easy to read over a typo (mpls ldp router-id loopback 1, instead of 0 for instance), but you will only be troubleshooting 2 or 3 devices at a time.
Today was a day of small OSPF labs and some MPLS lectures. The labs are interesting, but I went through them slowly, trying to attack them from different angles. It does help me be more precise. With that and me reviewing some of the processes tonight, I hope I will do a bit better tonight. I also have some fun ideas for labs and challenges of my own.
The results of the assessment lab are in. Diagnosis: I can’t read. I lost many points by not reading the questions correctly or be being not meticulous enough, and only a few because I didn’t understand the technologies. I know I am a slow reader, and I should just take the hit and spend an extra ten or fifteen minutes reading the questions.