We have been using mobile phones for a very long time now. I have been using smartphones for the last 8 years now, but I never cared to venture into the details of that how the phones actually work. Coming from an engineering background I already know some pieces but that knowledge is limited to… Read More How does the LTE 4G mobile Phone work?
Narrow Metric: We all know that by default the metric value for the ISIS route is 10 and it keeps on adding 10 on crossing every single link. For example, if the prefix has reached the router by crossing three links them the metric value associated with the prefix should be 40. See below example… Read More ISIS Metric types. Experimenting with wide and narrow metrics.
Configuring static MPLS TE tunnels can be a highly unmanageable task if the number of PE grows. On top of that, you also need to manage FRR backup tunnels, which is only going to add complexity. Take an example of the ISP that has 100 PE routers deployed. For 100 PE routers, if you need… Read More Cisco Dynamic MPLS Traffic Engineering Tunnels (Auto-Tunnels)
I have recently faced a problem with VNC after upgrading my home Ubuntu machine to 20.04. I have started getting below encryption error which I had to troubleshoot. “Unable to connect to VNC Server using your chosen security setting. Either upgrade VNC Server to a more recent version from RealVNC, or select a weaker level… Read More Linux : Unable to VNC after Ubuntu upgrade
Hello Folks, Welcome to my blog, in this blog, I am going to discuss the method which I always apply to check if the ISIS protocol is working perfectly on the router or not. The same process will also give some tips to troubleshoot the protocol. So let’s get started. In case you want to… Read More GNS3 LAB: Cisco ISIS, How to verify and troubleshoot.
Convergence time is a problem that humankind is trying to resolve since the day IGPs were discovered. Every vendor keeps on pushing less convergence time. With low “hold time” intervals we somehow manage to decrease the convergence time but this also has a limit, and the chances of raising bigger problems increase when we keep… Read More GNS3 LAB : LFA(Loop free alternate) and RLFA(Remote-LFA) on Cisco Routers.
Here is a quick example of configuring ISIS between two cisco IOS-XR devices. The configuration is a little different than how we do on Cisco IOS or IOS-XE devices, however, theoretically, it is exactly the same so it doesn’t take much to understand and learn the configuration. So let’s quickly jump to the configuration. Configuration… Read More How to configure ISIS on Cisco IOS-XR
Got a chance to see my other blogs on MPLS TE? I definitely recommend reading these below two because these will set the stage for this blog. MPLS TE basic config : GNS3 LAB Cisco : Quick Configuration MPLS TE (traffic engineering). MPLS TE fast-reroute link protection : GNS3 Cisco LAB : MPLS TE( Traffic-Engineering)… Read More GNS3 Cisco LAB : MPLS TE( Traffic-Engineering) FRR (fast-reroute) Node Protection.
Hello folks, In continuation of my previous blog on MPLS TE configuration, I have setup fast-reroute for MPLS TE tunnel so that if a designated primary link fails then the tunnel will take up the alternate path and the traffic loss will be avoided. Please check my previous blog for basic MPLS TE config in… Read More GNS3 Cisco LAB : MPLS TE( Traffic-Engineering) FRR (fast-reroute) Link Protection.
Hello folks, If you have visited my site earlier you might have seen an MPLS post related to the below network. I have been working on this network for around a month now and I plan to keep integrating different technologies in it until it breaks 🙂 (let’s see how much GNS3 on a 16… Read More GNS3 LAB Cisco : Quick Configuration MPLS TE (traffic engineering).