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Age !! define vrf The configuration of P is as follows: Image Route redirection ! Sending 1,ccna exam latest dumps free download, 1500-byte ICMP Echos to 2034::4, timeout is 2 seconds: Ipv6 router ospf 1 router-id 5.5.5.5 RA function on FDDI and Token Ring interfaces Image Exit GRE tunnel basic experiment Redistribution between different OSPF processes FastEthernet1/0 Image R1 and R2 are dual-stack routers that connect to both IPv6 and IPv4 networks. Image Check the VPNv6 prefix 2001:5555::5 on PE1 . You can see that the out label is 403. It is obvious that R4 is the label assigned by PE2 . This label is actually the label of VPNv6 . In order for PE2 to know, this data belongs to VRF . You can also use the following command to view Key configuration of R1 : 1 Neighbor 4.4.4.4 activate Ipv6 nat v6v4 pool v6v4-pool 202.101.100.10 202.101.100.20 prefix-length 24 ipv6 nat v6v4 source list ipv6only-network pool v6v4-pool address. In this way, B can actively access A , for example, B to ping 202.101.100.100 , can ping , the process is as follows: !! Attention tunnel mode Interface FastEthernet0/1 Router(config-rtr)# split-horizon Image Bgp connected eigrp Ipv6 address 2001:23::2/64 FastEthernet0/0, Forward, 00:00:04/00:03:24 Ipv6 nd prefix 2001:0001::/64 Ipv6 route 2002:CA65:1703::/48 Tunnel0 No auto-summary no synchronization exit-address-family Use route summarization! Looking at the picture above, in the previous scenario, we need to use 3 fine routes, but here we can achieve the same effect by using only one route. This route is the summary route of the three detailed routes in the previous scenario . A direct benefit of this configuration is that the router's routing table entries are greatly reduced. This mode of operation is called route summarization. Route summarization is a very important network design idea. Usually in a large and medium-sized network design, network and routing optimisation must be considered at all times. Route summarization is a time we need to shut down.