User Manual UMN:CLI
V5808
453
9.3.3.1 Rendezvous Point
In a shared tree, Rendezvous Point (RP) is a means for receivers to discover the sources
that send to a particular multicast group. It is responsible to receive all multicast traffic
from the sources and to forward that traffic to the receivers.
Static RP
To elect the RP among candidate RPs in the shared tree, the V5808 supports the BSR
mechanism (see Section 9.3.3.2) and static RP, and also supports the simultaneous use
of those. You can configure a router to use the static RP either for all the multicast groups
(default) or for specific multicast groups (with access lists). If multiple static RPs are
available for a single multicast group, the one with the highest IP address will be elected.
To statically specify an RP address for multicast groups, use the following command.
ip pim rp-address A.B.C.D [<1-
99> | <1300-1999>] [override]
Specifies an RP address for multicast groups.
A.B.C.D: RP address
1-99: IP standard access list
1300-1999: IP standard access list (extended range)
no ip pim rp-address A.B.C.D
Deletes a specified RP address for multicast groups
When the static RP and the RP elected through the BSR are both available for a multicast
group, the one elected through the BSR is chosen by default. If you, however, want to
choose the static RP for a multicast group in that situation, use the override option that
gives the higher priority to the static RP.
Keep Alive Time
After a multicast source registers with the RP, the DR of the multicast source periodically
sends the PIM null-register message to the RP to keep the (S, G) state between the
router and RP. The null-register message is the one without encapsulated multicast traffic.
If there is no null-register message during a given keep alive time (KAT), the multicast
routing entry with (S, G) state is expired, and the source registration process will restart.
To specify the keep alive time for (S, G) states at the RP, use the following command.
ip pim rp-register-kat <1-65535>
Specifies the KAT for (S, G) states at the RP.
1-65535: KAT value(unit: second)
no ip pim rp-register-kat
Deletes the specified KAT value.
Interface for Candidate RP
To elect the RP, each candidate RP sends its information to the BSR. This advertisement
contains the IP address and priority of the candidate RP and the multicast groups that it
can service. The BSR then periodically distributes the bootstrap message that includes a
set of the information received from each candidate RP (RP-set) to all the routers in the
PIM-SM domain.
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