The MEG DR for the SBD generates C-multicast source/shared tree join routes for receivers in the OISM domain. The following information applies to this procedure.
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This is homologous to a PIM DR and its Last Hop Router (LHR) function.
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For directly connected receivers, to the MEG DR, the MEG DR creates a Layer 3 multicast state upon receiving an IGMP or MLD message and generates the corresponding C-multicast routes. This handling applies to MEG and PEG PEs.
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For receivers not directly connected, the MEG DR creates a Layer 3 multicast state upon receiving an SMET route from the PE connected to the receiver. Based on this newly created state, the MEG generates the corresponding C-multicast routes. This scenario is shown in the following figure.
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The non-dr-attract-traffic command triggers the non-DR MEG to create Layer 3 multicast state too and advertises the C-multicast routes to attract the multicast traffic. The attracted multicast traffic is dropped at the non-DR MEG, however, by configuring this command the convergence is faster in case of a MEG DR failure.
