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Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

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

NOTE:

When the main processing unit (MPU), switch fabric unit (SFU), or central monitoring unit (CMU) has the backup, packets are not lost during hot swap.

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

Technology

Description

Link

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

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)

CFM, defines OAM functions, such as continuity check, linktrace and loopback, for Ethernet networks. CFM is network-level OAM and is applicable to large-scale end-to-end networking.

CFM 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

Technology

Description

Link

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

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Updated: 2019-03-21

Document ID: EDOC1000166606

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