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Configuration Guide - Reliability
S2720, S5700, and S6720 V200R013C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, MAC Swap Loopback Configuration, EFM Configuration, CFM Configuration, Y.1731 Configuration.

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Reliability Technologies

Reliability Technologies

Network reliability can be improved by increasing the MTBF or reducing the MTTR. Faults caused by various factors are inevitable, so fault recovery technologies are important. The following reliability technologies are mainly used to reduce the MTTR and meet level 3 reliability requirements.

Reliability technologies fall into fault detection technologies and protection switching technologies.

Fault Detection Technologies

Fault detection technologies focus on fault detection and diagnosis. Table 1-2 describes the fault detection technologies.

Table 1-2  Fault detection technologies




Bidirectional Forwarding Detection (BFD)

BFD is a unified detection mechanism independent of media and protocols, and is used to rapidly detect link faults and monitor IP connectivity.

BFD Configuration

Device Link Detection Protocol (DLDP)

DLDP monitors the link status of optical fibers or copper twisted-pairs. When a unidirectional link is detected, DLDP automatically shuts down or requests users to manually shut down the interface to prevent network faults.

DLDP Configuration

Monitor Link

Monitor Link associates an uplink interface with a downlink interface and is used on networks where Layer 2 topology protocols are used. Monitor Link monitors a device uplink interface and triggers the downlink interface status change according to the uplink interface status, which triggers switching of a topology protocol on the downstream device.

Smart Link and Monitor Link Configuration

MAC swap

MAC swap loopback allows the device to swap source and destination MAC addresses in the received Ethernet frame header and send the frame to the sender so that the link status between the two devices is monitored.

MAC Swap Loopback Configuration

Ethernet in the First Mile (EFM)

EFM monitors network faults and is for use on last-mile Ethernet access links to users on the network. EFM needs to be enabled on the two directly connected devices so that EFM can monitor the link between the two devices.

EFM Configuration

Connectivity Fault Management (CFM)

IEEE 802.1ag CFM and ITU-T Y.1731 are operation, administration, and maintenance (OAM) mechanisms on Layer 2 links based on Ethernet link detection and are used to detect link connectivity, check faults, and locate fault on Layer 2 networks.

CFM Configuration


Y.1731 Configuration

Protection Switching Technologies

Protection switching technologies focus on network recovery, and backs up hardware, link, service information, and routing information and perform fast switching to ensure service continuity. Table 1-3 describes protection switching technologies.

Table 1-3  Protection switching technologies




Virtual Router Redundancy Protocol (VRRP)

VRRP is a fault-tolerant protocol that allows the device to provide the default link when the default becomes faulty on LANs with multicast or broadcast capabilities. VRRP prevents network interruptions caused by the fault of the single link.

VRRP Configuration

Smart Link

Smart Link provides redundancy in dual-homing networking and fast convergence, and rapidly switches services to the standby link when the active link becomes faulty.

Smart Link and Monitor Link Configuration

Updated: 2019-04-04

Document ID: EDOC1100065682

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