选择第二层vs. Layer 3 Switches for Your Network Configuration
问工程师
杰克Kauter and Park Place Technologies Network Engineer, 兰德尔·格里尔, discuss a question from Abbotsford Police Department about whether to use layer 2 vs. layer 3 inter-switch links between the distribution and access layer switches of their network in this month’s 问工程师.
杰克: Hi guys it’s time for another episode of 问工程师. Joining me today is network engineer at Park Place, 兰德尔·格里尔. 兰德尔，最近怎么样?
兰德尔: 神奇的!
Difference Between Layer 2 and Layer 3 Switch
杰克: 很高兴听到你这么说. 兰德尔, today’s question was submitted by one of our viewers, 格雷厄姆, from Abbotsford Police Department in Canada. Now 格雷厄姆 is in the process of redesigning his network from the ground up and is considering layer 2 versus layer 3 inter-switch links between the distribution and access layer switches.
兰德尔 from your experience, what are you seeing for the most part for medium sized businesses today?
兰德尔: 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.
什么是二层交换机?
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.
- 易于设置
- Convergence takes several seconds
什么是三层交换机?
然而, if you need more advanced features like equal cost multi-pathing, 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.
- 等代价多路径
- 50 millisecond convergence
- 管理复杂
- 高级QOS
How Experience Effects 第二层vs. 三层交换
杰克: You mentioned experience that well, how can you tell me… Can you tell me a bit more about how experience comes into play?
兰德尔: 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. 但总的来说, 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.
杰克: We’ve had some great insights and wonderful comparisons between layer two and layer three. Thanks for parting with your knowledge there, 兰德尔, And 格雷厄姆, who submitted the question. 我们希望这能有所帮助. 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 问工程师.
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