HOME / Huawei Switch Fiber Port Layer 2 and Layer 3

Article Overview

Huawei switch fiber ports can operate in either Layer 2 mode for VLAN-based switching or Layer 3 mode for routing, with mode switching supported on specific high-end models.

Layer 2 Mode

In Layer 2 mode, a Huawei fiber port functions as a standard Ethernet interface that forwards frames based on MAC addresses. By default, all Ethernet interfaces belong to VLAN 1 and can be assigned to other VLANs for traffic segmentation. Layer 2 ports are ideal for connecting endpoints like PCs, servers, or access points within the same VLAN. Key points include:

  • VLAN membership controls broadcast domains and isolates traffic between VLANs.
  • Layer 2 ports can be configured as access ports (single VLAN) or trunk ports (multiple VLANs) for inter-switch connections.
  • Commands to configure Layer 2 mode typically include entering the interface view and setting the port link type to access or trunk ( ).

Layer 3 Mode

In Layer 3 mode, the fiber port acts as a routable interface, capable of forwarding packets based on IP addresses. This mode is used for inter-VLAN routing or connecting different network segments. Key aspects include:

  • Assign an IP address to the interface to serve as a gateway for connected devices.
  • The interface is removed from VLAN 1 only after Layer 3 protocols are active.
  • Layer 3 mode is supported on specific Huawei switch models such as S5731-H, S5732-H, S6735-S, S6720-EI, and S6730-H ( ).
  • Commands include undo portswitch to enable Layer 3 mode, followed by ip address <IP> <mask> to assign the interface IP ( ).

Switching Between Layer 2 and Layer 3

Huawei switches allow certain interfaces to switch between Layer 2 and Layer 3 modes:

  1. Enter system view: system-view
  2. Select the interface: interface gigabitethernet 0/0/20
  3. Switch to Layer 3: undo portswitch (for supported interfaces)
  4. Switch back to Layer 2: portswitch or configure as access/trunk
  5. Clear any service configurations (like trunk settings) before switching modes to avoid conflicts ( ).

Inter-VLAN Routing

For Layer 3 switches, VLANIF interfaces are created to enable routing between VLANs:

  • Each VLAN requires a VLANIF interface with an assigned IP address.
  • Devices in different VLANs use the VLANIF IP as their default gateway.
  • This allows Layer 3 switches to perform inter-VLAN routing without relying on external routers ( ).

Summary

  • Layer 2 ports: MAC-based switching, VLAN segmentation, access/trunk configuration.
  • Layer 3 ports: IP-based routing, gateway assignment, inter-VLAN communication.
  • Mode switching: Supported on high-end Huawei switches; requires clearing service configurations and using system/interface commands.
  • Use case: Layer 2 for local LAN traffic, Layer 3 for routing between VLANs or network segments. By understanding these modes and commands, network engineers can configure Huawei fiber ports to optimize both switching efficiency and routing capabilities in enterprise networks.

Huawei Technical Support

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Huawei Switch Fiber Port Layer 2 and Layer 3
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