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Interface fast1/0 ipv6 enable Use MD5 with BGP4+ R4 and R2 , we look R2 , R2 moment from R4 has learned this RIP routes, if it from the R3 also learn the route and of the route metric is smaller,ccna dumps download, then, R2 will preferably from R3 this Routes , so that R1 , R2 , and R3 form a routing loop. 20 . 6PE : 6PE technology relies on BGP , BGP 's Peer is the need to manually specify, it can be regarded as a semi-automatic tunneling technology. Neighbor 2.2.2.2 update-source Loopback0 Define multiple serial numbers under route-map . The serial number has a priority order when performing matching actions. R3 will initiate a Register to the RP and the multicast data will be sent to R1 . At this time, the multicast data is actually going to R1, that is, to the receiver, but in fact, some more complicated things are still happening underneath. R1 receipt Register Thereafter, there will be formed the source wishes SPT , so it asks R2 issued a SPT of the join message, R2 after receiving own Fa0 / 0 is added to the corresponding port multicast table entry outgoing interface list of . However, since the multicast data is always sent from the Fa1/0 port of R2 (because when we tested, the specified outgoing interface is Fa1/0 ), R1 continuously receives the multicast data sent by R3 and encapsulates the multicast data. Register , but did not receive alongSPT passed down the multicast data, therefore, Rl is not to R3 transmits Register-STOP , R3 registration process can be repeated, the multicast data will always be encapsulated in Register transmitted message Rl .