This read-only counter tallies the number of malformed Path Error messages received on this interface. Since Path Error messages themselves are meant to report problems, a malformed one could mask a real underlying failure from being properly diagnosed, making this counter useful for an administrator to notice when error reporting itself is unreliable on this link. Repeated csRsvpIfBadPathErrIn increments alongside unresolved path setup failures would suggest checking for a buggy or incompatible RSVP peer generating malformed error reports.