Category:

intent-verification │ network-diagrams

End to end network path analysis

If a user reports that a certain application is not working for them, especially after a migration or a change, how do you verify the connectivity? Finding a…
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Spotting Single Points of Failure in a graph

Enterprise networks should never have Single Points of Failure (a.k.a SPOF) in their daily operation. SPOF in general is an element in a system which, if stopped, causes…
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Chasing routes in the network

Have you ever tried to find out why the dynamic routing protocol in your network is not passing specific prefix as expected? And the situation had not improved…
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Dynamic Diagrams part 1

The best way to get a quick overview of any network infrastructure is by viewing a diagram (or most likely set of diagrams). The human brain can receive…
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Managing changes in the network

Large enterprise networks are constantly changing. Even if no administrative or configuration change activity is planned, the network lives by itself — the devices and links are going up/down and…
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Instant Business-Level Network Analysis Reports

Overall state of the network often must be presented in condensed form to managers and non-it personnel. How can you create the reports focusing mostly on the risk…
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Network gateway redundancy verification

Each network with multiple users should have a redundant gateway implemented as an exit point. For the end users, some form of first-hop redundancy protocol such as VRRP,…
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Balancing traffic on aggregation channels

Since the invention of EtherChannels, link aggregation bundles provide a convenient way to increase capacity or reliability of network transport paths. How can you ensure that the traffic…
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Keeping the L2 switching domains stable

Many problems in the current Ethernet layer 2 switched networks can come as a result of the behavior of the Spanning Tree Protocol and its derivatives. Its fail-open…
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Evaluating network performance using loss and topology awareness

Monitoring loss in a specific flow or service is precise but has a number of inherent disadvantages, such as that it must be explicitly provisioned, that the resulting…
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