Which command will help determine if the primary Ethernet adapter in an EtherChannel has failed and the backup adapter is being used?

ethstat is not a standard AIX command and does not exist for monitoring EtherChannel or adapter failover status.

The entstat command (Ethernet statistics) provides low-level adapter state details including EtherChannel aggregation status, making it possible to see whether a primary adapter failure has occurred and the backup adapter has assumed the active role. It is the standard AIX tool for diagnosing link-level failover events within an EtherChannel (IEEE 802.3ad or AIX Link Aggregation).

ifconfig shows interface address configuration and basic operational state (UP/DOWN) but does not expose EtherChannel-specific aggregation and failover detail.

lsagg lists configured EtherChannel aggregations and their members but does not provide real-time statistics showing that a primary-to-backup failover has taken place.