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NE20E-S V800R010C10SPC500 Feature Description - Interface and Data Link 01

This is NE20E-S V800R010C10SPC500 Feature Description - Interface and Data Link
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Forwarding Plane

Forwarding Plane

On the forwarding plane of a port extension system, an AP uses the internal forwarding channel to send packets received from an external communication interface to a master. The AP also receives packets from the master through the internal forwarding channel and sends them through an external communication interface. The AP is only responsible for data forwarding, and services are processed on the master's port extension interface.

On the network shown in Figure 3-5, after the control plane is configured, the master's port 1-1 becomes an internal communication interface, the AP2000's port 1 becomes an internal communication interface, and the AP2000's ports 2 to 4 become external communication interfaces. The master creates three port extension interfaces port 2000-2, port 2000-3, and port 2000-4 for the AP2000's three external communication interfaces. The master allocates three NVTAGs to the AP2000's three external communication interfaces. The master and AP deliver NVTAGs through forwarding entries. The master's forwarding entries record the relationships among internal communication interfaces, port extension interfaces, and NVTAGs. The AP's forwarding entries record the relationships among internal communication interfaces, external communication interfaces, and NVTAGs.

After receiving a data packet from an external communication interface (for example, port 2), the AP adds an NVTAG (for example, NVTAG2) to the packet based on forwarding entries, and then forwards the packet to the AP's internal communication interface port 1. The packet is finally transmitted to the master's internal communication interface port 1-1. Based on the internal communication interface of the packet and NVTAG2 carried in the packet, the master can find a uniquely determined port extension interface (port 2000-2). The master forwards the packet based on services configured on the port extension interface. The transmission process for a master-to-AP data packet is similar to that for an AP-to-master data packet.

Figure 3-5 Data forwarding in a port extension system
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Updated: 2019-01-03

Document ID: EDOC1100055118

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