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When traffic is distributed across the various sessions that make up a rotate and backup or a preferential link, it is resequenced to ensure that it is presented to the remote regions in the same order as it left the transmitting region. This occurs regardless of network route bandwidths which could lead to faster transmission across one session than another.
Failure of one session in a multi-session link does not disrupt the logical link. Traffic traversing the session at the time of failure is resequenced as required and retransmitted across one of the surviving sessions.
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