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S12700 V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Licensing Requirements and Limitations for VLANs

Licensing Requirements and Limitations for VLANs

Involved Network Elements

Other network elements are not required.

Licensing Requirements

VLAN is a basic feature of a switch and is not under license control.

Version Requirements

Table 4-6  Products and versions supporting VLANs



Software Version


S12708, S12712

V200R005C00, V200R006C00, V200R007C00, V200R007C20, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00


V200R010C00, V200R011C10, V200R012C00, V200R013C00


V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

  • Table 4-7 describes the VLAN specifications of different switch models.
    Table 4-7  VLAN specifications of different switch models
    Item Specification

    Maximum number of VLANs in the system

    4096 (VLAN 0 and VLAN 4095 are reserved)

    Maximum number of VLANIF interfaces in the system


  • If LNP is used to dynamically negotiate the link type (LNP is enabled by default), it is recommended that each interface be added to a maximum of 1000 VLANs and a maximum of 200 interfaces be configured on a switch. If 4094 VLANs are configured globally, it is recommended that a maximum of 50 interfaces be enabled with LNP. Otherwise, the alarm about a high CPU usage is generated for a short time.
  • Plan service and management VLANs so that any broadcast storms in service VLANs do not affect switch management.
  • In practice, specify VLANs from which packets need to be transparently transmitted by a trunk interface. Avoid using the port trunk allow-pass vlan all command if possible.
  • All interfaces join VLAN 1 by default. When unknown unicast, multicast, or broadcast packets of VLAN 1 exist on the network, broadcast storms may occur. Note the following guidelines and limitations when using VLAN 1:
    • Do not use VLAN 1 as the management VLAN or service VLAN.
    • To prevent loops, remove unnecessary interfaces from VLAN 1. Configure a trunk interface to permit packets from VLAN 1. If a trunk interface rejects packets from VLAN 1, some protocol packets transmitted in VLAN 1 may be incorrectly discarded. To prevent such faults, take measures to prevent potential risks when packets of VLAN 1 are allowed to pass through.
    • If a spanning tree protocol is used and a trunk interface on the switch rejects packets from VLAN 1, run the stp bpdu vlan command to enable the switch to encapsulate the specified VLAN ID in outgoing STP BPDUs so that the spanning tree protocol runs properly.
    • You are advised to remove interfaces from VLAN 1 in Eth-Trunk or ring networking.
    • When the switch connects to an access device, do not configure the uplink interface of the access device to transparently transmit packets from VLAN 1. This prevents broadcast storms in VLAN 1.
    • When an interface is bound to a VLANIF interface for Layer 3 forwarding, remove the interface from VLAN 1 to prevent Layer 2 loops in VLAN 1.
Updated: 2019-01-18

Document ID: EDOC1100038103

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