Network Data from Unix to Excel: Put It All Together (Part 6)

Did you enjoy last five posts about Excel, but you still don’t get the network part? Let’s summarize it once again and let me explain the tools I have created. Next post will give you some tips, so you can build your own set of tools.

Idea is about swinging the network from primary data center to disaster recovery data center. Here is an overall diagram once again.

Which Prefixes Are Permitted When Having Route Map and Prefix List under BGP Neighbor

Long name for a post, but rises valid question. Which prefixes are permitted, if you have both route map and prefix list implemented at the same time under BGP neighbor? They are implemented in the outbound direction first.

The trick here is that you have a particular prefix, which is permitted in both route map and prefix list. Then other prefix, which is permitted in route map, but in prefix list is denied. Then other prefix, permitted in route map and not present in prefix list. And what if other prefix is denied in route map and permitted in prefix list? I have created 9 combinations in total. Here is a chart:

Create Your Own JavaScript Network Configuration Program (Part 18) – Verification Plan

We have code for implementation, but we are missing verification. We should have a list of commands that we want to run and mark the results. As I don’t want to forget on something, I add verification plan to this wonderful tool.

Network Data from Unix to Excel: Routes in BGP Summary (Part 5)

Routing table showed us, which routers are swung and which are not. Output from BGP summary is more granular and it shows us OK status per BGP neighbor. If you have problem with the whole routing table, output from today’s post will narrow down problems. Also, it serves as a crosscheck for routing table. Along with other tools like community, we can ultimately say, if the device works or not. After this final post, summary and make your own set of tools follow.

Show IP Route Profile

I have showed couple of show ip route commands. What about show ip route profile? What is it? It shows you number of changes in routing table in 5 seconds frequency. I am using the same topology with the same routing tables as in previous post. To refresh our memory:

Create Your Own JavaScript Network Configuration Program (Part 17) – Different Browsers

Have you tried my script in different browsers? So many things not working right? Let’s correct it! We know that it works under Firefox.

Ubuntu

I will start testing browsers under Ubuntu first.

Opera Support

Select Primary WAN circuit and hit the magic button.

Network Data from Unix to Excel: Count Next Hop IPs in Routing Table (Part 4)

Today I present something very useful, which you might even use someday. I will be counting number of next hops for networks in routing table. Based on the numbers I can determine, if most of the routes are going to primary DC or to secondary DC. I want to go to secondary DC during DR mode, which I am doing here. This is an ultimate test, which sufficiently tells you that network swing was successful. And of course, output is provided in nice Excel sheet, which is easily understandable also by non-technical people. Output clearly shows you problems with devices and errors on them.

300 Posts on rekrowteN | Networker

Why to even blog? Isn’t it a waste of time? Hell no!

I have learned sooo much by trying to explain, what I have read. If you read something, good, you forget it. If you do a lab, good, you forget it. But if you write a blog about it, you forget about it too, but at least you know, where to find the information. I was trying to find something on Google and I have found my own blog, where I have found answer. Whenever we troubleshoot Cisco ACE, me and my colleagues are always getting back here to refresh our memory. It already helped us several times to fasten the troubleshooting process.

Create Your Own JavaScript Network Configuration Program (Part 16) – Integrated Help and Docummentation

I will integrate help menu option to the code. That will serve as our documentation. Each input, checkbox, drop down box and textarea will have unique explanation. And I will show you another cool feature in HTML and CSS.

How Can I Help You?

Help menu will be in our new top menu, which is always in front of you, no matter how much you scroll. There will be one checkbox, where you can select help. If selected, help is displayed in bottom right. Help is displayed, when hovered over some element, which has help assigned to it.

Network Data from Unix to Excel: Status of WAN Interfaces (Part 3)

We are over with communities. Today, we determine status of WAN interfaces. How do you want to swing network to backup DC, if your WAN interfaces are not in the best shape of their life? This will also serve for one important thing. It might happen that you don’t have DR subnet configured at all. Either IP address is wrong or such a subinterface doesn’t exist on purpose. We need to find it out, so it will not screw up following tables.