说明:此案例使用两台cisco2500路由器,IOS (tm) 2500 Software (C2500-IS-L), Version 12.2(15)T9,利用ip v4主干加ipv6的6to4 tunnel结合ipv6静态路由,就能实现两个远程ipv6子网的互连互通. 　　拓扑说明:使用两台路由器的e0接口互连仿真ipv4的主干,使用loopback0仿真两个远程的ipv6子网,6to4tunnel必须在所有的ipv6子网使用标准的ipv6地址前缀(2002::/16)进行编址. 　　在两个端点建立tunnel时,必须使用本地路由器的ipv4接口的ip地址结合2002前缀来对本路由器的tunnel接口做编址.例如R1的e0:192.168.1.1,则R1的tunnel接口的ipv6地址一定要包含此地址的16进制格式,即2002:C0A8:101:…,其中C0A8:101即为e0接口ip地址的16进制. 配置和测试结果如下: R1#sh run hostname R1 ipv6 unicast-routing interface Loopback0 　　no ip address 　　ipv6 address 2002:C0A8:101:1::1/64 interface Tunnel0 　　no ip address 　　no ip redirects 　　ipv6 address 2002:C0A8:101:13::1/64 　　tunnel source Ethernet0 　　tunnel mode ipv6ip 6to4 interface Ethernet0 　　ip address 192.168.1.1 255.255.255.0 ipv6 route 2002::/16 Tunnel0R1#sh ipv6 int brief Ethernet0　　 　　　　　[up/up] 　　unassigned Loopback0　　　　　　　 [up/up] 　　FE80::210:7BFF:FE36:491 　　2002:C0A8:101:1::1 Tunnel0 　　　　　　　　[up/up] 　　FE80::C0A8:101 　　2002:C0A8:101:13::1 Virtual-Access1 　　　　[up/up] 　　unassigned R1#sh ipv6 route IPv6 Routing Table - 8 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP 　　U - Per-user Static route 　　I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea 　　O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 S 2002::/16 [1/0] 　　via ::, Tunnel0 C 2002:C0A8:101:1::/64 [0/0] 　　via ::, Loopback0 L 2002:C0A8:101:1::1/128 [0/0] 　　via ::, Loopback0 C 2002:C0A8:101:13::/64 [0/0] 　　via ::, Tunnel0 L 2002:C0A8:101:13::1/128 [0/0] 　　via ::, Tunnel0 L FE80::/10 [0/0] 　　via ::, Null0 L FF00::/8 [0/0] 　　via ::, Null0 r3#sh run hostname r3 ipv6 unicast-routing interface Loopback0 　no ip address 　ipv6 address 2002:C0A8:103:3::3/64 interface Tunnel0 　no ip address 　no ip redirects 　ipv6 address 2002:C0A8:103:13::3/64 　tunnel source Ethernet0 　tunnel mode ipv6ip 6to4 interface Ethernet0 　ip address 192.168.1.3 255.255.255.0 ipv6 route 2002::/16 Tunnel0 r3#sh ipv6 int brief Ethernet0 　　　　　[up/up] 　　unassigned Loopback0 　　　　　[up/up] 　　FE80::200:CFF:FE0A:26BC 　　2002:C0A8:103:3::3 Serial0 　　　　　　[administratively down/down] 　　unassigned Serial1　　　　　　 [administratively down/down] 　　unassigned Tunnel0　　　　　　 [up/up] 　　FE80::C0A8:103 　　2002:C0A8:103:13::3 Virtual-Access1　　 [up/up] 　　unassigned r3#sh ipv6 route IPv6 Routing Table - 7 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP 　　U - Per-user Static route 　　I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea 　　O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 S 2002::/16 [1/0] 　　via ::, Tunnel0 C 2002:C0A8:103:3::/64 [0/0] 　　via ::, Loopback0 L 2002:C0A8:103:3::3/128 [0/0] 　　via ::, Loopback0 C 2002:C0A8:103:13::/64 [0/0] 　　via ::, Tunnel0 L 2002:C0A8:103:13::3/128 [0/0] 　　via ::, Tunnel0 L FE80::/10 [0/0] 　　via ::, Null0 L FF00::/8 [0/0] 　　via ::, Null0 [b]在R1上测试直连的ipv6 tunnel接口:[/b] R1#ping ipv6 2002:c0a8:103:13::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2002:C0A8:103:13::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/16 ms [b]在R1上测试到R3的ipv6 loopback0接口(非直连):[/b] R1#ping ipv6 2002:c0a8:103:3::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2002:C0A8:103:3::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/12/16 ms 文章录入：csh    责任编辑：csh