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# On Router A, enable IP multicast routing.
<RouterA> system-view
[RouterA] multicast routing
[RouterA-mrib] quit
# Enable IGMP on the receiver-side interface (GigabitEthernet 1/0/1).
[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] igmp enable
[RouterA-GigabitEthernet1/0/1] quit
# Enable PIM-SM on the other interfaces.
[RouterA] interface gigabitethernet 1/0/2
[RouterA-GigabitEthernet1/0/2] pim sm
[RouterA-GigabitEthernet1/0/2] quit
[RouterA] interface gigabitethernet 1/0/3
[RouterA-GigabitEthernet1/0/3] pim sm
[RouterA-GigabitEthernet1/0/3] quit
[RouterA] interface loopback 0
[RouterA-LoopBack0] pim sm
[RouterA-LoopBack0] quit
# Enable IP multicast routing, IGMP, and PIM-SM on Router B, Router C, and Router D in the
same way Router A is configured. (Details not shown.)
# Configure PIM domain borders on Router C.
[RouterC] interface gigabitethernet 1/0/2
[RouterC-GigabitEthernet1/0/2] pim bsr-boundary
[RouterC-GigabitEthernet1/0/2] quit
[RouterC] interface gigabitethernet 1/0/3
[RouterC-GigabitEthernet1/0/3] pim bsr-boundary
[RouterC-GigabitEthernet1/0/3] quit
[RouterC] interface gigabitethernet 1/0/4
[RouterC-GigabitEthernet1/0/4] pim bsr-boundary
[RouterC-GigabitEthernet1/0/4] quit
# Configure PIM domain borders on Router A, Router B, and Router D in the same way Router
C is configured. (Details not shown.)
4. Configure C-BSRs and C-RPs:
# Configure Loopback 0 on Router A as a C-BSR and a C-RP.
[RouterA] pim
[RouterA-pim] c-bsr 1.1.1.1
[RouterA-pim] c-rp 1.1.1.1
[RouterA-pim] quit
# Configure C-BSRs and C-RPs on Router C and Router D in the same way Router A is
configured. (Details not shown.)
5. Configure MSDP peers:
# Configure an MSDP peer on Router A.
[RouterA] msdp
[RouterA-msdp] peer 192.168.1.2 connect-interface gigabitethernet 1/0/3
[RouterA-msdp] quit
# Configure MSDP peers on Router C.
[RouterC] msdp
[RouterC-msdp] peer 192.168.1.1 connect-interface gigabitethernet 1/0/3
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