PLANET XGS3-24040 - Manual (Page 374)

Chapter 43 Ipv4 Multicast Protocol
43-28
1 Once this router (as a RP) receives the
register message from a DR unicast, it should
forward it to other RP in the network to notify
all the RP in the network of the source (S.G)
state. While forwarding, the router will change
the destination address of the register
message into other-rp-address.
2 Multiple other-rp-addresses can be
configured in accordance with one
anycast-rp-addr, Once the register message
from a DR is received, it should be forwarded
to all of these other RP one by one.
No operation will cancel an other-rp-address
communicating with this router.
43.5.3 ANYCAST RP Configuration Examples
Figure 1-6 The ANYCAST RP v4 function of the router
As shown in the Figure, the overall network environment is PIM-SM, which provides two routers supporting
ANYCAST RP, RP1 and RP2. Once multicast data from the multicast source server reaches the DR, the DR
will send a multicast source register message to the nearest RP unicast according to the unicast routing
algorithm, which is RP1 in this example. When RP1 receives the register message from the DR, besides
redistributing to the shared tree according to the orderers who already join it, it will forward the multicast
register message to RP2 to guarantee that all orders that already join RP2 can find the multicast source.
Since there is an ANYCAST list maintained on router RP1 that has been configured with ANYCAST RP, and
since this list contains the unicast addresses of all the other RP in the network, when the RP1 receives the
register message, it can use the self-r-address, which identifies itself as the source address to forward the
Multicast Server
VLAN1:10.1.1.1
VLAN1:192.168.1.4
VLAN2:192.168.2.1
VLAN2:192.168.2.5
VLAN2:192.168.3.2
VLAN2:2.2.2.2
receiver receiver
receiver
RP2
RP1
DR
………