This read-write value sets the number of seconds between entire backup-trunk call-setup cycles, the pause after a full set of retries, per lportBuTrkRetryNum each spaced by lportBuTrkRetryInt, has been exhausted before the switch starts a fresh round of attempts. An admin sets this to control the overall persistence and pacing of long-term backup-establishment attempts when a backup path is proving difficult to establish, avoiding continuous retry storms. For example, setting lportBuTrkCycleInt to 300 means after a failed cycle of retries, the switch waits 5 minutes before beginning the next full attempt cycle to reach the backup trunk.