Configure the line CARDS and ports for layer 3 (VLan routing) by doing the following.

执行以下操作为第3层(vlan路由层)配置线卡和端口。

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Routing is a function associated with the network layer (layer 3) in the standard model of network programming, the Open Systems Interconnection (OSI) model.

在开放系统互连osi模型中，路由是网络层(第三层)的功能。

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IP, located one layer down, at the OSI network layer, or layer 3, communicates the addresses of each packet's sender and receiver to the routers along the way.

IP位于下一层，在OSI的网络层，即第三层，把每个包的发送者和接收者地址告诉一路上各个路由器。

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Some 600, 000 years ago, it erupted and left an ash layer 3 meters deep as far as 1, 600 kilometers away.

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Unlike most other portable media players on the market, the device will play EPAC files instead of MP3 (Motion Picture Experts Group, Audio Layer 3) files, the companies said.

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