說明:此案例使用兩臺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結合ipv6靜態(tài)路由,就能實現(xiàn)兩個遠程ipv6子網(wǎng)的互連互通.

　　拓撲說明:使用兩臺路由器的e0接口互連仿真ipv4的主干,使用loopback0仿真兩個遠程的ipv6子網(wǎng),6to4tunnel必須在所有的ipv6子網(wǎng)使用標準的ipv6地址前綴(2002::/16)進行編址.

　　在兩個端點建立tunnel時,必須使用本地路由器的ipv4接口的ip地址結合2002前綴來對本路由器的tunnel接口做編址.例如R1的e0:192.168.1.1,則R1的tunnel接口的ipv6地址一定要包含此地址的16進制格式,即2002:C0A8:101:…,其中C0A8:101即為e0接口ip地址的16進制.

配置和測試結果如下:
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 Tunnel0

R1#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

在R1上測試直連的ipv6 tunnel接口:
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

在R1上測試到R3的ipv6 loopback0接口(非直連):
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

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