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CLI-based Configuration Guide - Reliability

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Application Scenarios for Interface Monitoring Groups

Application Scenarios for Interface Monitoring Groups

As shown in Figure 3-2, Router2 is the backup of Router1, 3 LSWs are dual-homed to the two Routers to implement traffic load balancing, and the Routers are connected to 3 routers. If the links between Router1 and Router A and between Router1 and Router B fail, only the link between Router1 and Router C is available. The LSWs, however, cannot detect the link failures, and still send packets to Router C through Router1. As a result, the link between Router1 and Router C is overloaded.

Figure 3-2  Interface monitoring group

To address the problem, deploy a monitoring group on Router1 and Router2, and add multiple network-side interfaces of a Router to the interface monitoring group. The interface monitoring group monitors the status of the network-side interfaces. If the number of network-side interfaces in the Down state reaches a certain value, the interface monitoring group triggers the status of corresponding access-side interfaces to change, triggering a master/backup switchover of access-side links. This prevents traffic overload and ensures normal service forwarding.

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Updated: 2019-03-06

Document ID: EDOC1100069338

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