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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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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. DLDP, and Ethernet OAM are link-layer fault detection technologies, and Monitor Link is associated with other reliability technologies. Table 11-2 describes the fault detection technologies.

Table 11-2 Fault detection technologies





Bidirectional Forwarding Detection (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


The Device Link Detection Protocol (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


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

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 11-3 describes protection switching technologies.

Table 11-3 Protection switching technologies





The Virtual Router Redundancy Protocol (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: 2019-08-09

Document ID: EDOC1000041694

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