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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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Cascading of Smart Link and Monitor Link

Cascading of Smart Link and Monitor Link

Figure 6-14 shows cascading of Smart Link and Monitor Link, in which a Smart Link group can function as the uplink interface of a Monitor Link group. This networking provides enhanced reliability in link backup.

Figure 6-14  Cascading of Smart Link and Monitor Link

In Figure 6-14, the uplink interfaces on SwitchC and SwitchJ are added to Smart Link groups to guarantee reliability. Monitor Link groups are configured on SwitchC and SwitchJ, with the Smart Link groups serving as uplink interfaces. An active/standby switchover will be triggered on SwitchF only if both the two uplink interfaces in a Smart Link group are Down.

Table 6-1 lists the Smart Link and Monitor Link configuration on the switches.
Table 6-1  Configuration of Smart Link and Monitor Link

Smart Link Group

Monitor Link Group

Master Interface

Slave Interface

Uplink Interface

Downlink Interface


Interface C2

Interface C3

Smart Link group

Interface C2, Interface C3

Interface C1


Interface J2

Interface J3

Smart Link group

Interface J2, Interface J3

Interface J1


Interface F1

Interface F2

No Monitor Link group configured

Updated: 2019-08-21

Document ID: EDOC1000141941

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