Layer 2 vs. Layer 3 Network Switching – Ask the Engineer | Park Place

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Jack: Hi guys it’s time for another episode of Ask the Engineer. Joining me today is network engineer at Park Place, Randall Greer. Randall, how’s it going?

Randall: Fantastic!

Jack: That’s great to hear. Randall, today’s question was submitted by one of our viewers, Graham, from Abbotsford Police Department in Canada.
Now Graham is in the process of redesigning his network from the ground up and is considering layer 2 versus layer 3 interswitch links between the distribution and access layer switches. Randall from your experience, what are you seeing for the most part for medium sized businesses today?

Randall: You know I’m seeing that it there… There’s two aspects to it. The first is, you know, who’s going to be deploying it, what… what their skill level is. And, then what are the actual features and uptimes that you’re looking for.
If you’re looking for something that’s relatively easy to set up and you don’t mind a convergence that will take more than a few seconds, then doing layer two is a fine choice.
However, if you need more advanced features like equal cost multipathing, advanced QOS or you want to faster convergence, which we can get around about 50 milliseconds, then layer three would be the way to go.
The caveat there–that layer three is a bit more complex to manage.

Jack: You mentioned experience that well, how can you tell me… Can you tell me a bit more about how experience comes into play?

Randall: Yeah, the there… There is some complexity in managing a layer three network. You have to manage a routing protocol on top of it. Whereas on the layer two network, that’s by default going to be managed by some flavor of spanning tree depending on what vendor you go with.
But by and large, if you’re doing layer two, it’s mostly plug and play unless you turn on some advanced features for optimization, but you can just plug it in and it’ll work. Whereas if you want to layer three network, you really got to plan it out and know what you’re doing with regard to IP addressing, what routing protocol to use and whether or not you’re going to use advanced features like VFP.

Jack: We’ve had some great insights and wonderful comparisons between layer two and layer three. Thanks for parting with your knowledge there, Randall, And Graham, who submitted the question.
We hope that helps. If anyone has any follow up questions or something new to ask our engineers, you can do so by reaching directly out to us.
In the meantime, we’ll see you next time on Ask the Engineer.

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