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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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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 technology is a basic feature of a switch and is not under license control.

Version Requirements

Table 4-6  Products and versions supporting VLAN technology

Series

Products

Software Version

S7700

S7703, S7706, S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10

S9700

S9703, S9706, S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10

NOTE:
To know details about software mappings, see Hardware Query Tool.

Feature Limitations

  • Table 4-7 describes the specifications of VLAN technology.
    Table 4-7  Specifications of VLAN technology
    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

    S9703 and S7703: 2048; other models: 4094

  • If LNP is used to dynamically negotiate the link type (LNP is enabled by default), it is recommended that each interface should be added to a maximum of 1000 VLANs and a maximum of 200 interfaces should be configured on a switch. If 4094 VLANs are configured globally, it is recommended that a maximum of 50 interfaces should be enabled with LNP. Otherwise, the alarm about a high CPU usage is generated for a short time.
  • You are advised to 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. Do not use the port trunk allow-pass vlan all command if possible.
  • In earlier versions of V200R005, before changing the interface type, restore the default VLAN of the interface.
  • In earlier versions of V200R005, before deleting a VLAN where a VLANIF interface has been configured, run the undo interface vlanif vlan-id command to delete the VLANIF interface.
  • 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. When VLAN 1 is used, pay attention to the following points:
    • You are not advised to use VLAN 1 as the management VLAN or service VLAN.
    • Remove the interfaces that do not need to join VLAN 1 from VLAN 1 to prevent loops. A trunk interface often permits packets from VLAN 1 to pass through. 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, to prevent broadcast storms in VLAN 1, do not configure the uplink interface of the access device to transparently transmit packets from 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.
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Updated: 2019-10-18

Document ID: EDOC1000178310

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