H3C S5120-EI Series Configuration Manual

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H3C S5120-EI Series Configuration Manual Manual pdf 11 page image

2High availability technologiesIncreasing MTBF or decreasing MTTR can enhance the availability of a network. The high availabilitytechnologies described in this section meet the level 2 and level 3 high availability requirements bydecreasing MTTR.High availability technologies can be classified as fault detection technologies or protection switchovertechnologies.Fault detection technologiesFault detection technologies enable detection and diagnosis of network faults. CFD, DLDP, and EthernetOAM are data link layer fault detection technologies. NQA is used for diagnosis and evaluation ofnetwork quality. Monitor Link and Track work along with other high availability technologies to detectfaults through a collaboration mechanism.Table 2 Fault detection technologiesTechnology Introduction ReferenceCFDConnectivity Fault Detection (CFD), which conforms to IEEE802.1ag Connectivity Fault Management (CFM) and ITU-TY.1731, is an end-to-end per-VLAN link layer Operations,Administration and Maintenance (OAM) mechanism used forlink connectivity detection, fault verification, and faultlocation."Configuring CFD" in HighAvailability ConfigurationGuideDLDPThe Device link detection protocol (DLDP) deals withunidirectional links that may occur in a network. Upondetecting a unidirectional link, DLDP, as configured, can shutdown the related port automatically or prompt users to takeactions to avoid network problems."Configuring DLDP" inHigh AvailabilityConfiguration GuideEthernet OAMAs a tool monitoring Layer 2 link status, Ethernet OAM ismainly used to address common link-related issues on the "lastmile". You can monitor the status of the point-to-point linkbetween two directly connected devices by enabling EthernetOAM on them."Configuring EthernetOAM" in High AvailabilityConfiguration GuideNQANetwork Quality Analyzer (NQA) analyzes networkperformance, services and service quality through sending testpackets, and provides you with network performance andservice quality parameters such as jitter, TCP connectiondelay, FTP connection delay and file transfer rate."Configuring NQA" inNetwork Managementand MonitoringConfiguration GuideMonitor LinkMonitor Link works together with Layer 2 topology protocols toadapt the up/down state of a downlink port to the state of anuplink port. This feature enables fast link switchover on adownstream device in response to the uplink state change onits upstream device."Configuring Monitor Link"in High AvailabilityConfiguration Guide