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  Address      Interface            Ver/   Nbr    Query  DR    DR
  Mode   Count  Intvl  Prior
  192.168.4.1      FastEthernet0         v2/D    0         30       1      192.168.4.1
  192.168.0.1         Seria              v2/D    1         30       1       0.0.0.0
  192.168.1.1         Ser                v2/D    1         30       1       0.0.0.0
  （2）  Router_A
    show ip mroute
  01:12:33: PIM: Send v2 Hello on Serial0/1
    01:12:33: PIM: Received v2 Hello on Serial0/1 from 192.168.1.1route
    IP Multicast Routing Table
    Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
               L - Local, P - Pruned, R - RP-bit set, F - Register flag,
               T - SPT-bit set, J - Join SPT, M - MSDP created entry,
               X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
               U - URD, I - Received Source Specific Host Report, s - SSM
    Outgoing interface flags: H - Hardware switched
    Timers: Uptime/Expires
    Interface state: Interface, Next-Hop or VCD, State/Mode
  (*, 224.0.1.40), 00:11:33/00:00:00, RP 0.0.0.0, flags: DCL
        Incoming interface: Null, RPF nbr 0.0.0.0
      Outgoing interface list:
        Serial0/1, Forward/Dense, 00:11:33/00:00:00
    FastEthernet0/0, Forward/Dense, 00:11:33/00:00:00
    （3）  Router_B
  RouterB#show ip pim neighbor