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ba318150fa
The IOU override of _ubridge_apply_markers lacked the incremental guard the generic path has, so on an NIO update it re-added every marker the port already carried. uBridge's add_packet_filter rejects a duplicate filter name (packet_filter.c find_packet_filter), so adding a private marker to an IOU link that already hosted an inherited global-* copy failed with 'Failed to add filter global-...' -- the NIO update re-sends ALL markers on the port (inherited + new private), and the pre-existing one collided. Add the same (name, link_id) in self._marker_filter_bridges skip as the generic base_node path, so an update only installs markers not already on the port. Mirrors how Dynamips/vpcs/etc. stay idempotent across add + update.