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CLI-based Configuration Guide - Network Management and Monitoring

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Application Scenarios for LSDP

Application Scenarios for LSDP

This section describes the LSDP application scenario.

LSDP Application

LSDP monitors link connectivity in real time. When a link fails, LSDP sets the interface status on the local end to Down so that all services on this interface become invalid. When the link is recovered, LSDP sets the interface status to Up.

On a network with dual-link or multi-link configured, a device can use the Simple Network Management Protocol (SNMP) to send an interface Down alarm to the network management system (NMS) through a working link. Then traffic is quickly switched to the working link. This improves service transmission reliability.

Figure 8-2  LSDP network diagram

As shown in Figure 8-2, the egress gateway RouterA of the branch connects to the Internet through GE1/0/0. The link connected to GE1/0/0 is the primary link, and the link connected to GE1/0/1 is the backup link. LSDP is configured on RouterA's GE1/0/0 to detect link connectivity between the branch and headquarters. When the link from RouterD to RouterB fails, LSDP sets the status of RouterA's GE1/0/0 to Down, and then services are transmitted through the backup link.

When the link from RouterD to RouterB is recovered, LSDP sets the status of RouterA's GE1/0/0 to Up, and the primary link takes over services.

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Updated: 2019-05-17

Document ID: EDOC1000174072

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