When configuring the RPs for a PIM-SM domain, you want to limit the address range so the router acting as the RP does not need to handle traffic for so many multicast groups.
Specify the group address range when you configure the RP:
[edit protocols pim] aviva@RouterA# set rp local address 192.168.13.1 group-ranges 22.214.171.124/8
When you configure a PIM router to be an RP, by default it is eligible to be the RP for all groups. For IPv4 the default group range is 126.96.36.199/4, and for IPv6 it is FF70::/12 to FFF0::/12. If some multicast groups are sending a lot of traffic, a single RP might become overwhelmed with handling it all. To minimize router overload and congestion, configure several RPs and have each one of them act as RP only for a limited range of group addresses.
This recipe shows how to limit an RP to handle only groups in the 188.8.131.52/8 range. To verify that the configuration has taken effect, look at the RP routers:
aviva@RouterA> show pim rps Instance: PIM.master Address family INET RP address Type Holdtime Timeout Active groups Group prefixes 192.168.13.1 bootstrap 150 None 4 184.108.40.206/8 192.168.13.1 static 0 None 4 220.127.116.11/8 Address family INET6
The Group prefixes column shows that this router is now RP only for the range 18.104.22.168/8. It is no longer RP for the default range of 22.214.171.124/4.
You can limit the group address range serviced by the RP regardless of the method you choose to establish the RP routers in your PIM-SM domain. The show pim rps output above tells you that the RP router was configured using a bootstrap router. You can also use the set rp local address group-ranges command if you configure the RP manually, with auto-RP, or with anycast.
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