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Tag Archives: IOS
Verifying Cisco IOS File Integrity
Moving files on Cisco devices is important to know how to do but knowing the files are free of errors is also important. If you have every upgraded a device and find that it won’t boot because the image file corrupted you certainly know what I’m talking about. While this happens very rarely it’s important none the less. Additionally, knowing that you got the IOS from Cisco without it being tampered with is also important from a security standpoint. First, jump onto Cisco.com and log in with your Cisco ID. Access the download section for a device you have support … Continue reading
Route Summarization Basics
With the advent of Variable Length Subnet Masks (VLMS) and classless networking keeping track of where exactly IP address space physically resides on the network has become a bit more complicated simply because we have the options and the flexibility to break networks into smaller subnets. Chances are you are probably at least somewhat familiar with subnetting but may not be as familiar with route summarization. Summarization is basically reversing the same actions of subnetting. This can also be called supernetting by the way. Really, in today’s world you can basically manipulate the subnet mask in any way you like … Continue reading
Cisco Layer 2 Tunneling
To a student of networking the OSI model can be a little hard to appreciate until its application is actually seen a few times in the real world. Likewise understanding that you can grab frames or packets and encapsulate them inside other higher layer protocols is also confusing to the newbie. An Ethernet pseudo-wire is a great example of this. Essentially, you can capture an entire Data Link layer frame as it enters an interface, encapsulate it, and deliver it out another interface no matter what type of network you have in between. Cool stuff right? Let’s dive in and … Continue reading
Posted in Networking Tagged cisco, configuration, IOS, networking, packet capture, service provider Leave a comment
Basic Routing Protocol Configuration in VRF Lite
You may recall me posting a basic conceptual article about VRF’s and VRF lite implementation. Well, I am finally back with some more advanced concepts. What good are separate routing instances without the ability to use routing protocols and share routes between routers? Let’s dive right in and see how it’s done! Continue reading
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