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Figure 1-3 Creating an RPF route
As shown in
Figure
When no multicast static route is configured, the hosts (Receivers) in the OSPF domain cannot receive
the multicast packets sent by the multicast source (Source) in the RIP domain. After you configure a
multicast static route on Router C and Router D, specifying Router B as the RPF neighbor of Router C
and specifying Router C as the RPF neighbor of Router D, the receivers can receive multicast data sent
by the multicast source.
A multicast static route only affects RPF check; it cannot guide multicast forwarding. Therefore, a
multicast static route is also called an RPF static route.
A multicast static route is effective only on the multicast router on which it is configured, and will not
be advertised throughout the network or redistributed to other routers.
Multicast Traceroute
The multicast traceroute utility is used to trace the path that a multicast stream flows down from the
first-hop router to the last-hop router.
Concepts in multicast traceroute
1)
Last-hop router: If a router has one of its interfaces connecting to the subnet the given destination
address is on, and if the router is able to forward multicast streams from the given multicast source
onto that subnet, that router is called last-hop router.
2)
First-hop router: the router that directly connects to the multicast source.
3)
Querier: the router requesting the multicast traceroute.
1-3, the RIP domain and the OSPF domain are unicast isolated from each other.
1-5
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