Backup with NetVault Backup Plug-in for SnapMirror to Tape fials by network error

• ONTAP 9
• NDMP
• NetVault Backup Plug-in for SnapMirror to Tape

• Backup with NetVault Backup Plug-in for SnapMirror to Tape sometimes fails
• /mroot/etc/log/backup indicates backup is aborted with Replication operation request due to a network error. after three attempts to restart the transfer and encountering additional errors

BKP-Start (baseline backup of Backup Set ID f200cebb-9f32-48b0-85d7-d13505ff933d)
BKP-Xfer-Start (chunk_num=1 blks_written=7 transfer_id=86bf41d3-eb6c-4701-9663-71bd85dad878)
..
BKP-Info (replication_sender_error=91)
BKP-Xfer-Fail-Info (status=91 failure_message=5898741 failure_message_detail=4063241)
BKP-Xfer-Restart (chunk_num=153496 blks_written=71374722 transfer_id=4b3f88cd-2a14-465e-af27-5d4cb2529401)
..
BKP-Info (replication_sender_error=91)
BKP-Xfer-Fail-Info (status=91 failure_message=5898741 failure_message_detail=4063241)
BKP-Xfer-Restart (chunk_num=275694 blks_written=128196792 transfer_id=1f9834b9-181a-4d60-aa6c-5496a5a23a7f)
..
BKP-Info (replication_sender_error=91)
BKP-Xfer-Fail-Info (status=91 failure_message=5898741 failure_message_detail=4063241)
BKP-Xfer-Restart (chunk_num=436385 blks_written=202918107 transfer_id=97c2569e-14fa-49d7-a076-ab6235d9665f)
BKP-Info (replication_sender_error=91)
BKP-Xfer-Fail-Info (status=91 failure_message=5898741 failure_message_detail=4063241)
BKP-Xfer-Fail-Info (status=91 failure_message=5898741 failure_message_detail=4063241)
BKP-TRSE-State-Machine-Exit (exit_status=8212)
BKP-Xfer-Conclude (chunk_num=437582 blks_written=203474712)
BKP-Tape-Stats (wait_time=0s wait_count=0 total_count=0 avail_count=0/0/0/0)
BKP-Abort (transfer failed (Replication operation request due to a network error.) 38:1457)

• EMS smtape.bkp.fail is detected with error string transfer failed (Replication operation request due to a network error.)