EVPN Port-Active Redundancy Mode

The Multi-Chassis Link Aggregation Group (MC-LAG) technology enables the establishment of a logical link-aggregation connection with a redundant group of independent nodes. It is the typical deployment for EVPN multihoming redundancy. However, MC-LAG decouples the service from the core to CE, and there are circumstances when we need active/standby interface-level redundancy instead of per-flow load balancing to achieve certain Quality of Service (QoS) features. draft-ietf-bess-evpn-mh-pa introduces a LACP-based port-active redundancy mode to deal with this requirement.
In our test, we configured EVPN-VPWS as the service for traffic. We had two switchover runs: the first was to manually shut down the active port in the LACP group, and the second was to change the inactive port with a higher preference. During the entire testing procedure, unicast traffic was continuously sent, and we only observed packet loss when the switchover occurred, with recovery taking place within three seconds. Due to time constraints, we did not perform the preference-based switchover for combination 4.
Spirent TestCenter was used as the traffic generator for this test.