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Data MDT Receivers

When the Receiver C-PIM-SM receives a <C-SG, P-G> MDT Join TLV message from the default MDT, it extracts the C-SG and the data MDT P-Group address from the TLV and queries the route map that you specified for the data MDT to determine whether the C-SG is a candidate for a data MDT. If it matches, the C-PIM-SM adds the MDT Join TLV to its database and records the time.

If the Receiver C-PIM-SM does not receive an MDT Join TLV<C-SG, P-G> to refresh its database within the amount of time specified for the timeout in the mdt-data-timeout command, the MDT Join TLV<C-SG> is removed from the database and the associated data MDT is removed.

When a new MDT Join TLV<C-SG, P-G> is added to the database, the Receiver C-PIM-SM determines whether it has an SG, SPT state. If it has an SG state, and the incoming interface (IIF) is the default MDT, then C-PIM-SM creates the data MDT and deletes the corresponding forwarding entry. C-PIM-SM waits for the source to transmit data on the data MDT. During this period, data can continue to be received on the default MDT. C-PIM-SM fails the reverse-path forwarding (RPF) check, which results in a forwarding entry with a discarded IIF.

If the C-SG,SPT state is created (either as a result of a C-SSM join or switch from RPT to SPT), and it is the default MDT, the Receiver C-PIM-SM determines whether an MDT Join TLV<C-SG> is active. If it is, C-PIM-SM creates the data MDT.

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