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NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access

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Overview of Trunk

Overview of Trunk


Trunk is a technology that bundles multiple physical interfaces into a single logical interface. This logical interface is called a trunk interface, and each bundled physical interface is called a member interface.

Trunk technology helps increase bandwidth, enhance reliability, and carry out load balancing.


Without trunk technology, the transmission rate between two network devices connected by a 100 Mbit/s Ethernet twisted pair cable can only reach 100 Mbit/s. To obtain a higher transmission rate, you must change the transmission media or upgrade the network to a Gigabit Ethernet, which is costly to small- and medium- sized enterprises and schools.

Trunk technology provides an economical solution. For example, a trunk interface with three 100 Mbit/s member interfaces working in full-duplex mode can provide a maximum bandwidth of 300 Mbit/s.

Both Ethernet interfaces and Packet over SONET/SDH (POS) interfaces can be bundled into a trunk interface. These two types of interfaces, however, cannot be member interfaces of the same trunk interface. The reasons are as follows:
  • Ethernet interfaces apply to a broadcast network where packets are sent to all devices on the network.

  • POS interfaces apply to a P2P network, because the link layer protocol of POS interfaces is High-level Data Link Control (HDLC), which is a point-to-point (P2P) protocol.


This feature offers the following benefits:

  • Increased bandwidth

  • Improved link reliability through traffic load balancing

Updated: 2019-01-02

Document ID: EDOC1100058405

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