Associating the Backup Member Interface of an Eth-Trunk in LACP Mode with Its Primary Member Interface

Context

In a port connectivity check (port CC) scenario (no service is bound), an Eth-Trunk in LACP mode is configured on two devices. To ensure that services are not interrupted, associate the backup member interface of the Eth-Trunk in LACP mode with its primary member interface. If the primary link has poor quality, traffic is promptly switched to the standby link.

Only the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this configuration.

Prerequisites

Link aggregation in LACP mode has been configured, the maximum number of active links at both ends is 1, and two member interfaces have been added to the Eth-Trunk at both ends. For details, see Configuring Link Aggregation in LACP Mode.
Basic Y.1731 configurations have been completed, including the Maintenance Association (MA), Maintenance Domain (MD), Maintenance Association End Point (MEP), and test instance. For details, see Y.1731 Configuration in S2720, S5700, and S6700 V200R019C10 Configuration Guide - Reliability. In this scenario, note the following points:
- The map vlan vlan-id command cannot be used to bind an MA to a VLAN.
- Only the outward-facing MEP can be created.

Procedure

Run system-view
The system view is displayed.
Run interface interface-type interface-number
The primary member interface view of an Eth-Trunk's Actor is displayed.
Run one of following commands to configure the interface according to your network requirements:
1. Run delay-measure two-way { delay-threshold | variation-threshold } test-id test-id trigger if-down
  The interface is triggered to go ETHOAM down when the delay or delay variation based on a test instance ID exceeds a specified threshold.
2. Run loss-measure single-ended-synthetic { local-ratio-threshold | remote-ratio-threshold } test-id test-id trigger if-down
  The interface is triggered to go ETHOAM down when the near- or far-end frame loss ratio based on a test instance ID exceeds a specified threshold.
Run quit
Return to the system view.
Run interface interface-type interface-number
The backup member interface view of an Eth-Trunk's Actor is displayed.
Run lacp track interface interface-type interface-number priority-reduced value
The backup member interface is associated with the primary member interface, and the priority of the backup member interface is dynamically changed.

When the primary link's quality recovers, run the lacp force-switch command in the Eth-Trunk interface view to enable forcible switching if no preemption is configured or preemption is enabled but the delay is not reached.