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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, 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 Loopback Detection

Licensing Requirements and Limitations for Loopback Detection

Involved Network Elements

Other network elements are not required.

Licensing Requirements

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

Version Requirements

Table 13-1 Products and minimum version supporting loopback detection

Product Model

Minimum Version Required

CE8860EI

V100R006C00

CE8861EI/CE8868EI

V200R005C10

CE8850-32CQ-EI

V200R002C50

CE8850-64CQ-EI

V200R005C00

CE7850EI

V100R003C00

CE7855EI

V200R001C00

CE6810EI

V100R003C00

CE6810-48S4Q-LI/CE6810-48S-LI

V100R003C10

CE6810-32T16S4Q-LI/CE6810-24S2Q-LI

V100R005C10

CE6850EI

V100R001C00

CE6850-48S6Q-HI

V100R005C00

CE6850-48T6Q-HI/CE6850U-HI/CE6851HI

V100R005C10

CE6855HI

V200R001C00

CE6856HI

V200R002C50

CE6857EI

V200R005C10

CE6860EI

V200R002C50

CE6865EI

V200R005C00

CE6870-24S6CQ-EI/CE6870-48S6CQ-EI

V200R001C00

CE6870-48T6CQ-EI

V200R002C50

CE6875-48S4CQ-EI

V200R003C00

CE5810EI

V100R002C00

CE5850EI

V100R001C00

CE5850HI

V100R003C00

CE5855EI

V100R005C10

Feature Limitations

  • LBDT needs to send a large number of detection packets to detect loops, occupying system resources. Therefore, disable LBDT if loops do not need to be detected.

  • LBDT is a ring network protocol that conflicts with ring network functions such as ERPS, Smart Link, and STP/RSTP/MSTP/VBST. You are advised not to configure these ring network functions on an LBDT-enabled interface. In contrary, if these ring network functions are configured, disable LBDT on the interface.

  • In V100R005C00 and earlier versions, LBDT cannot be configured on an Eth-Trunk or its member interfaces.

  • When two or more LBDT-enabled interfaces are added to the same VLAN, if loops occur on the network, the hwLdtPortLoop alarm may be frequently generated or cleared on some interfaces, and MAC address flapping may occur between these interfaces. In this case, please configure the interfaces to enter the Error-Down state or manually check the network to eliminate loops.
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Updated: 2019-05-08

Document ID: EDOC1100004351

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