The master and the slave MPUs are synchronized only in terms of configuration information and routing information is available on the master MPU only, not available on the slave MPU (an exception is static routing, which belongs to configuration information). Normally, the master MPU calculates the routing information and delivers it to the LPUs. The LPUs forward traffic according to the delivered information. If the master MPU faults, the slave MPU will be activated. In that case, the slave MPU does not have the routing information, so calculation needs to be done again. After that, routing information on the LPUs should to be refreshed .During the calculation, the LPUs forward traffic according to the previous route buffer. During switchover of the S9500 series, as the forwarding entries on the LPU remain the same, the forwarding is not affected, but if the forwarding is trans-board, transient interruption will happen to the switchover.
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