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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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Unidirectional Link Detection When Multiple Neighbors Exist

Unidirectional Link Detection When Multiple Neighbors Exist

DLDP can be configured for devices connected by hubs to detect unidirectional links. Each interface detects at least one neighbor.

As shown in Figure 4-7, a hub connects SwitchA to SwitchB, SwitchC, and SwitchD through copper twisted pairs or optical fibers. All switches support DLDP. To detect unidirectional links on this network, enable DLDP on all switch interfaces connected to the hub.

Figure 4-7 Networking diagram of multiple neighbors

On a network with multiple neighbors, an interface immediately enters the Disable state if it receives Disable packets from a neighbor or detects that a neighbor is unidirectional. When SwitchA, SwitchB, and SwitchC detect a unidirectional link fault on SwitchD, they transit to Disable state. This can prevent traffic forwarding errors when the topology changes. If the Rx optical fiber between SwitchB and the hub is disconnected when SwitchA is forwarding traffic to SwitchB, SwitchA shuts down its interface connected to the hub and stops sending packets to SwitchB, SwitchC, and SwitchD. If a backup link exists between SwitchA and SwitchB, STP immediately starts the backup link when SwitchA shuts down the interface.

If the switches in the preceding networking diagram are connected by a device that has DLDP disabled but supports DLDPDU forwarding, DLDP still detects unidirectional links as if a network has multiple neighbors.

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Updated: 2019-03-21

Document ID: EDOC1000166606

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