This reports whether a specific remote transport address for this multihomed association is currently considered reachable (active) or has crossed the no-response threshold and is being treated as unreachable (inactive), per the SCTP specification's path-monitoring logic. It's the direct indicator of which of a peer's multiple addresses SCTP currently trusts for sending data, which matters for confirming multihoming failover behavior is working as designed. If a secondary path shows inactive while the primary shows active, traffic correctly continues over the primary; but if both show inactive simultaneously, the entire association is effectively unreachable even if cSctpAssocState hasn't yet reflected that.