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Integrated Routing and Bridging
Sorry for the lack of updates lately but I spent the whole last week skiing and recharging my batteries and now I’m back fully motivated to continue my path to the lab. This time we will be talking...
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Don’t forget ip routing on switches
Yesterday I did a vol3 lab and one of the tasks was to enable EIGRP on a couple of the switches. I had enabled EIGRP, however I was not getting any routes installed in the routing table. Look at the...
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Redistribution lab in GNS3/Dynamips
At first I had some trouble understanding route redistribution. I’ve tried getting better at it and now I have a solid understanding of it. Darren did some labs on his blog and I decided to give it a...
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OSPF adjacency over non common subnet
Found out an interesting thing while doing a Vol3 lab. We all know that EIGRP will not form an adjacency over a non common subnet unless special circumstances. What about OSPF? I had a lab task where I...
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Conditional default route – RIP
I did Vol1 RIP labs yesterday and I wanted to show you some cool stuff. How to do conditional default routing, this is lab stuff but some of it is definetely useful for real life deployments as well. I...
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RIP timers
RIP timers are the most basic thing in the world right? Even the command to set them is named timers basic… However in some documentation it is not really clear what the difference is between the...
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OSPF Vol1 finished
Finished OSPF Vol1 tonight. I should know pretty much everything about OSPF by now. Here are some advice that I think is good when handling OSPF. show ip ospf data self-originate – Will show what LSAs...
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Route redistribution – filtering and mitigating loops
This post is about route redistribution and the different filtering techniques we have available in our toolbelt. This post requires that you have a basic understanding of route redistribution. For...
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Tiebreakers with routes from different OSPF processes
This post is inspired by a discussion at Twitter with Ivan Pepelnjak and Nicolas Michel. Nicolas asked what happens when there is the same route from two different OSPF processes. Which one will be...
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EIGRP named configuration
You might think that EIGRP being around for so long is not getting any attention from Cisco, not true. EIGRP is still being developed and in later releases you can run what is called named...
View ArticleGeneral – Challenges in Load Balancing Traffic
For the last year I have been working a lot with IWAN which is Cisco’s SD-WAN implementation (before Viptela acquisition). One of the important aspects of SD-WAN is to be able to load balance the...
View ArticleGeneral – Advice on Numbering Policies in Networking
There are several situations where we need to write some form of policy such as QoS, routing policies used in for example redistribution, filtering and policy-based routing, dot1x and so on. Lately I...
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Route Replication the Easy Way
Easy Virtual Network (EVN) was a technology Cisco came up with back in the days to make it easier to implement VRFs without the pain of running VRF lite or the complexity of running a full MPLS + BGP...
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