What is the RP for IPv6 multicast address FF76:0130:2001:db8:3811::2323?
A.
2001:db8:3811::1
B.
2001:db8:3811::2323
C.
2001:db8:3811::0130
D.
2001:db8:3811::3
E.
2001:db8:3811::6
Explanation:
Embedded RP defines an address allocation policy in which the address of the RP is encoded in
an IPv6 multicast group address. This allows an easy deployment of scalable inter-domain
multicast and simplifies the intra-domain multicast configuration as well. IPv6 Multicast group
addresses embedded with RP information start with ff70::/12 where the flag value of 7 means
embedded RP.
There is no need to pre-configure routers with the RP address information. Routers can
automatically extract and use the RP information from the IPv6 multicast group address. This
allows for a large number of RPs to be deployed anywhere in the Internet. Embedded RP requires
no change in protocol operations. It can be considered an automatic replacement for static RP
configuration.
The router can learn only one RP address for a multicast group using embedded RP. It cannot
support RP redundancy. Proposals are being considered to introduce RP redundancy by
mechanisms other than BSR for IPv6 multicast. Embedded RP does not support Bidirectional PIM.
Embedded RP allows the application to dictate which router is the RP. There is the possibility that
a low-end router could end up becoming the RP for hundreds of high data rate sources if the
application defines an erroneous RP address (this can be prevented by disabling Embedded RP
learning).
For more information on Embedded RP, see RFC3956.http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6552/whitepaper_c11-508498.html
