ENSP实现IPV4与IPV6的双栈
双栈：设备能同时工作在IPV4与IPV6两种网络中，能同时与IPV4和IPV6网络中的设备进行通信。
IPV6的特点：
1：全球单播地址—IPV6网络中没有NAT。
2：可聚合性—IANA组织对全球的IPV6地址进行合理分配。
3：多宿主—在一个物理接口上可以同时配置多个不同网段的IPV6地址，不同接口的IPV6地址不能处于同一网段。
4：自动配置：
1>：DHCP
2>：auto-config—在路由接口手工配置IPV6地址，随后路由器将自己地址的前缀（网络号）下放给PC，PC使用EUI-64来补充主机位。
5：即插即用—支持热插拔。
6：端到端连接—不需要NAT。
7：重编址。
8：简易的报头：
1>：没有广播机制，只有单播和组播。
2>：没有校验盒（2、4层均存在校验盒）。
3>：流标签—QOS
9：安全性和移动性。
10：IPV4和IPV6可以共存。
双栈及不同IPV6局域网之间的通信案例
拓扑图：
注：路由器连接的蓝色线表示环回。
要求：
1：两个局域网基于6 to 4 tunnel进行通信。
2：R1环回可以访问R3的环回。
配置及思路：
1：实现R2、R3、R4所在IPV4局域网全网可达。
R2：
[r2]interface GigabitEthernet 0/0/0
[r2-GigabitEthernet0/0/0]ip add
[r2-GigabitEthernet0/0/0]ip address 23.1.1.1 24
[r2-GigabitEthernet0/0/0]quit
[r2]ip route-static 0.0.0.0 0 23.1.1.2
R3：
[r3]interface GigabitEthernet 0/0/1
[r3-GigabitEthernet0/0/1]ip address 23.1.1.2 24
[r3-GigabitEthernet0/0/1]quit
[r3]interface LoopBack 0
[r3-LoopBack0]ip address 3.3.3.3 24
[r3-LoopBack0]quit
[r3]interface GigabitEthernet 0/0/0
[r3-GigabitEthernet0/0/0]ip address 34.1.1.2 24
[r3-GigabitEthernet0/0/0]quit
R4：
[r4]interface GigabitEthernet 0/0/1
[r4-GigabitEthernet0/0/1]ip address 34.1.1.1 24
[r4-GigabitEthernet0/0/1]quit
[r4]ip route-static 0.0.0.0 0 34.1.1.2
测试：
R2：
R4：
2：配置R1、R2所在的IPV4局域网并可正常访问R3环回。
R1：
[r1]interface GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]ip address 192.168.0.1 26
[r1-GigabitEthernet0/0/0]quit
[r1]interface LoopBack 0
[r1-LoopBack0]ip address 192.168.0.65 27
[r1-LoopBack0]quit
[r1]interface lo
[r1]interface LoopBack 1
[r1-LoopBack1]ip address 192.168.0.97 27
[r1-LoopBack1]quit
[r1]rip 1
[r1-rip-1]version 2
[r1-rip-1]network 192.168.0.0
[r1-rip-1]quit
[r1]interface GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]rip summary-address 192.168.0.64 255.255.255.192
[r1-GigabitEthernet0/0/0]quit
R2：
[r2]interface GigabitEthernet 0/0/1
[r2-GigabitEthernet0/0/1]ip address 192.168.0.2 26
[r2-GigabitEthernet0/0/1]quit
[r2]interface LoopBack 0
[r2-LoopBack0]ip address 192.168.0.129 26
[r2-LoopBack0]quit
[r2]rip 1
[r2-rip-1]version 2
[r2-rip-1]network 192.168.0.0
[r2-rip-1]quit
[r2]rip 1
[r2-rip-1]default-route originate
[r2-rip-1]quit
[r2]acl 2000
[r2-acl-basic-2000]rule 5 permit source 192.168.0.0 0.0.0.255
[r2-acl-basic-2000]quit
[r2]interface GigabitEthernet 0/0/0
[r2-GigabitEthernet0/0/0]nat outbound 2000
[r2-GigabitEthernet0/0/0]quit
测试：
3：在R1、R2上配置IPV6网络。
地址规划：
2002:1701:101::/64 R2环回
2002:1701:101:1::/64 骨干
2002:1701:101:2::/64 R1环回
2002:1701:101:2::/65
2002:1701:101:2:8000::/65
R1：
[r1]ipv6
[r1]interface GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]ipv6 enable
[r1-GigabitEthernet0/0/0]ipv6 address 2002:1701:101:1::1/64
[r1-GigabitEthernet0/0/0]quit
[r1]interface LoopBack 0
[r1-LoopBack0]ipv6 enable
[r1-LoopBack0]ipv6 address 2002:1701:101:2::1/65
[r1-LoopBack0]quit
[r1]interface LoopBack 1
[r1-LoopBack1]ipv6 enable
[r1-LoopBack1]ipv6 address 2002:1701:101:2:8000::1/65
[r1-LoopBack1]quit
[r1]ripng 1
[r1-ripng-1]quit
[r1]interface LoopBack 0
[r1-LoopBack0]ripng 1 enable
[r1-LoopBack0]quit
[r1]interface LoopBack 1
[r1-LoopBack1]ripng 1 enable
[r1-LoopBack1]quit
[r1]interface GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]ripng 1 enable
[r1-GigabitEthernet0/0/0]quit
[r1]interface GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]ripng summary-address 2002:1701:101:2:: 64
[r1-GigabitEthernet0/0/0]quit
R2：
[r2]ipv6
[r2]interface GigabitEthernet 0/0/1
[r2-GigabitEthernet0/0/1]ipv6 enable
[r2-GigabitEthernet0/0/1]ipv6 address 2002:1701:101:1::2/64
[r2-GigabitEthernet0/0/1]quit
[r2]interface LoopBack 0
[r2-LoopBack0]ipv6 enable
[r2-LoopBack0]ipv6 address 2002:1701:101::1/64
[r2-LoopBack0]quit
[r2]ripng 1
[r2-ripng-1]quit
[r2]interface LoopBack 0
[r2-LoopBack0]ripng 1 enable
[r2-LoopBack0]quit
[r2]interface GigabitEthernet 0/0/1
[r2-GigabitEthernet0/0/1]ripng 1 enable
[r2-GigabitEthernet0/0/1]quit
[r2]interface Tunnel 0/0/0
[r2-Tunnel0/0/0]ipv6 enable
[r2-Tunnel0/0/0]ipv6 address 2002:1701:101:2::1/64
[r2-Tunnel0/0/0]tunnel-protocol ipv6-ipv4 6to4
[r2-Tunnel0/0/0]source 23.1.1.1
[r2-Tunnel0/0/0]quit
[r2]ipv6 route-static 2002:: 16 Tunnel 0/0/0
[r2]ripng 1
[r2-ripng-1]import-route static
[r2-ripng-1]quit
4：配置BGP区域。
地址规划：
2002:2201:101::/49 AS1
2002:2201:101::/64—2002:2201:101:7fff::/64
2002:2201:101:8000::/49 AS2
2002:2201:101:8000::/64—2002:2201:101:ffff::/64
1>：配置IPV6地址
R4:
[r4]ipv6
[r4]interface LoopBack 0
[r4-LoopBack0]ipv6 enable
[r4-LoopBack0]ipv6 address 2002:2201:101::1/64
[r4-LoopBack0]quit
[r4]interface GigabitEthernet 0/0/0
[r4-GigabitEthernet0/0/0]ipv6 enable
[r4-GigabitEthernet0/0/0]ipv6 address 2002:2201:101:1::1/64
[r4-GigabitEthernet0/0/0]quit
R5:
[r5]ipv6
[r5]interface GigabitEthernet 0/0/1
[r5-GigabitEthernet0/0/1]ipv6 enable
[r5-GigabitEthernet0/0/1]ipv6 address 2002:2201:101:1::2/64
[r5-GigabitEthernet0/0/1]quit
[r5]interface LoopBack 0
[r5-LoopBack0]ipv6 enable
[r5-LoopBack0]ipv6 address 2002:2201:101:8000::1/64
[r5-LoopBack0]quit
[r5]interface GigabitEthernet 0/0/0
[r5-GigabitEthernet0/0/0]ipv6 enable
[r5-GigabitEthernet0/0/0]ipv6 address 2002:2201:101:8001::1/64
[r5-GigabitEthernet0/0/0]quit
R6:
[r6]ipv6
[r6]interface GigabitEthernet 0/0/1
[r6-GigabitEthernet0/0/1]ipv6 enable
[r6-GigabitEthernet0/0/1]ipv6 address 2002:2201:101:8001::2/64
[r6-GigabitEthernet0/0/1]quit
[r6]interface LoopBack 0
[r6-LoopBack0]ipv6 enable
[r6-LoopBack0]ipv6 address 2002:2201:101:8002::1/64
[r6-LoopBack0]quit
[r6]interface g0/0/0
[r6-GigabitEthernet0/0/0]ipv6 enable
[r6-GigabitEthernet0/0/0]ipv6 address 2002:2201:101:8003::1/64
[r6-GigabitEthernet0/0/0]quit
R7:
[r7]ipv6
[r7]interface GigabitEthernet 0/0/1
[r7-GigabitEthernet0/0/1]ipv6 enable
[r7-GigabitEthernet0/0/1]ipv6 address 2002:2201:101:8003::2/64
[r7-GigabitEthernet0/0/1]quit
[r7]interface LoopBack 0
[r7-LoopBack0]ipv6 enable
[r7-LoopBack0]ipv6 address 2002:2201:101:8004::1/64
[r7-LoopBack0]quit
[r7]interface GigabitEthernet 0/0/0
[r7-GigabitEthernet0/0/0]ipv6 enable
[r7-GigabitEthernet0/0/0]ipv6 address 2002:2201:101:8005::1/64
[r7-GigabitEthernet0/0/0]quit
R8:
[r8]ipv6
[r8]interface GigabitEthernet 0/0/1
[r8-GigabitEthernet0/0/1]ipv6 enable
[r8-GigabitEthernet0/0/1]ipv6 address 2002:2201:101:8005::2/64
[r8-GigabitEthernet0/0/1]quit
[r8]interface LoopBack 0
[r8-LoopBack0]ipv6 enable
[r8-LoopBack0]ipv6 address 2002:2201:101:8006::1/64
[r8-LoopBack0]quit
2>：配置OSPFV3域
R5:
[r5]ospfv3 1
[r5-ospfv3-1]router-id 5.5.5.5
[r5-ospfv3-1]quit
[r5]interface g0/0/0
[r5-GigabitEthernet0/0/0]ospfv3 1 area 0
[r5-GigabitEthernet0/0/0]quit
[r5]interface LoopBack 0
[r5-LoopBack0]ospfv3 1 area 0
[r5-LoopBack0]quit
R6:
[r6]ospfv3 1
[r6-ospfv3-1]router-id 6.6.6.6
[r6-ospfv3-1]quit
[r6]interface GigabitEthernet 0/0/1
[r6-GigabitEthernet0/0/1]ospfv3 1 area 0
[r6-GigabitEthernet0/0/1]quit
[r6]interface LoopBack 0
[r6-LoopBack0]ospfv3 1 area 0
[r6-LoopBack0]quit
[r6]interface GigabitEthernet 0/0/0
[r6-GigabitEthernet0/0/0]ospfv3 1 area 0
[r6-GigabitEthernet0/0/0]quit
R7:
[r7]ospfv3 1
[r7-ospfv3-1]router-id 7.7.7.7
[r7-ospfv3-1]quit
[r7]interface GigabitEthernet 0/0/1
[r7-GigabitEthernet0/0/1]ospfv3 1 area 0
[r7-GigabitEthernet0/0/1]quit
[r7]interface LoopBack 0
[r7-LoopBack0]ospfv3 1 area 0
[r7-LoopBack0]quit
[r7]interface GigabitEthernet 0/0/0
[r7-GigabitEthernet0/0/0]ospfv3 1 area 0
[r7-GigabitEthernet0/0/0]quit
R8:
[r8]ospfv3 1
[r8-ospfv3-1]router-id 8.8.8.8
[r8-ospfv3-1]quit
[r8]interface GigabitEthernet 0/0/1
[r8-GigabitEthernet0/0/1]ospfv3 1 area 0
[r8-GigabitEthernet0/0/1]quit
[r8]interface LoopBack 0
[r8-LoopBack0]ospfv3 1 area 0
[r8-LoopBack0]quit
3>：配置BGP域
R4：
[r4]bgp 1
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 2002:2201:101:1::2 as-number 2
[r4-bgp]ipv6-family
[r4-bgp-af-ipv6]peer 2002:2201:101:1::2 enable
[r4-bgp-af-ipv6]quit
[r4-bgp]quit
R5:
[r5]bgp 64512
[r5-bgp]confederation id 2
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 2002:2201:101:1::1 as-number 1
[r5-bgp]ipv6-family
[r5-bgp-af-ipv6]peer 2002:2201:101:1::1 enable
[r5-bgp-af-ipv6]quit
[r5-bgp]peer 2002:2201:101:8002::1 as-number 64512
[r5-bgp]peer 2002:2201:101:8002::1 connect-interface LoopBack 0
[r5-bgp]ipv6-family
[r5-bgp-af-ipv6]peer 2002:2201:101:8002::1 enable
[r5-bgp-af-ipv6]quit
R6:
[r6]bgp 64512
[r6-bgp]confederation id 2
[r6-bgp]router-id 6.6.6.6
[r6-bgp]peer 2002:2201:101:8000::1 as-number 64512
[r6-bgp]peer 2002:2201:101:8000::1 connect-interface LoopBack 0
[r6-bgp]ipv6-family
[r6-bgp-af-ipv6]peer 2002:2201:101:8000::1 enable
[r6-bgp-af-ipv6]quit
[r6-bgp]peer 2002:2201:101:8004::1 as-number 64512
[r6-bgp]peer 2002:2201:101:8004::1 connect-interface LoopBack 0
[r6-bgp]ipv6-family
[r6-bgp-af-ipv6]peer 2002:2201:101:8004::1 enable
[r6-bgp-af-ipv6]quit
[r6-bgp]
R7:
[r7]bgp 64512
[r7-bgp]confederation id 2
[r7-bgp]confederation peer-as 64513
[r7-bgp]router-id 7.7.7.7
[r7-bgp]peer 2002:2201:101:8002::1 as-number 64512
[r7-bgp]peer 2002:2201:101:8002::1 connect-interface LoopBack 0
[r7-bgp]ipv6-family
[r7-bgp-af-ipv6]peer 2002:2201:101:8002::1 enable
[r7-bgp-af-ipv6]quit
[r7-bgp]peer 2002:2201:101:8005::2 as-number 64513
[r7-bgp]peer 2002:2201:101:8005::2 ebgp-max-hop 2
[r7-bgp]ipv6-family
[r7-bgp-af-ipv6]peer 2002:2201:101:8005::2 enable
[r7-bgp-af-ipv6]quit
R8:
[r8]bgp 64513
[r8-bgp]confederation id 2
[r8-bgp]confederation peer-as 64512
[r8-bgp]router-id 8.8.8.8
[r8-bgp]peer 2002:2201:101:8005::1 as-number 64512
[r8-bgp]peer 2002:2201:101:8005::1 ebgp-max-hop 2
[r8-bgp]ipv6-family
[r8-bgp-af-ipv6]peer 2002:2201:101:8005::1 enable
[r8-bgp-af-ipv6]quit
4>:将路由宣告到BGP中实现BGP可达
R5：
[r5]ipv6 route-static 2002:2201:101:8000:: 49 NULL 0
[r5]bgp 64512
[r5-bgp]ipv6-family
[r5-bgp-af-ipv6]network 2002:2201:101:8000:: 49
[r5-bgp-af-ipv6]quit
[r5]bgp 64512
[r5-bgp]ipv6-family
[r5-bgp-af-ipv6]peer 2002:2201:101:8002::1 next-hop-local
[r5-bgp-af-ipv6]quit
R6：
[r6]bgp 64512
[r6-bgp]ipv6-family
[r6-bgp-af-ipv6]peer 2002:2201:101:8004::1 reflect-client
[r6-bgp-af-ipv6]quit
[r6-bgp]quit
5>：在R4上配置6 to 4 tunnel，并将路由宣告到BGP中
R4：
[r4]interface Tunnel 0/0/0
[r4-Tunnel0/0/0]ipv6 enable
[r4-Tunnel0/0/0]ipv6 address 2002:2201:101:2::1/64
[r4-Tunnel0/0/0]tunnel-protocol ipv6-ipv4 6to4
[r4-Tunnel0/0/0]source 34.1.1.1
[r4-Tunnel0/0/0]quit
[r4]ipv6 route-static 2002:: 16 Tunnel 0/0/0
[r4]bgp 1
[r4-bgp]ipv6-family
[r4-bgp-af-ipv6]network 2002:: 16
[r4-bgp-af-ipv6]quit
[r4-bgp]quit
5：测试—R1访问R3和R8的环回
访问R3环回：
访问R8环回：
至此，双栈与IPV6之间的互访已全部完成。由于ENSP可能存在BUG，会导致访问出现问题。保存配置后重启设备即可正常访问。