IPv6 过渡 - 隧道技术

一、拓扑：

二、配置过程：

1. AR2/3/4 配置 OSPF 互通，区域 0
2. AR1/2 配置 IPv6 地址，起 OSPFv3，AR2 配置打开路由通告
3. AR4/5 配置 IPv6 地址，起 isis ipv6，AR4 配置打开路由通告
4. AR2/4 起隧道，隧道协议分别用 GRE/ipv6-ipv4 做为隧道协议
5. AR2/4 分别配置静态路由到 AR5/1 的业务路由地址为隧道接口

三、测试：

在 AR1 上带源 ping ipv6 AR5 的业务地址：

在 AR2 的 G0/0/0 口抓包，看到是纯 IPv6 包：

在AR2 的 G0/0/0 口抓包，看到是 IPv4 用隧道包裹了 IPv6 通过 IPv4 网络：

换用 IPv6-IPv4 隧道协议，可以看到IPv4 直接包裹了 IPv6，少了 GRE 头部，减小了载荷：

四、所有配置：

AR1：

ipv6 # ospfv3 1 router-id 10.1.1.1 # interface GigabitEthernet0/0/0 ipv6 enable ipv6 address 2001::12:1/64 ipv6 address FE80::1 link-local ospfv3 1 area 0.0.0.0 # interface LoopBack0 ipv6 enable ipv6 address 1111::1/64 ospfv3 1 area 0.0.0.0 #

AR2：

ipv6 # ospfv3 1 router-id 10.2.2.2 default-route-advertise always # interface GigabitEthernet0/0/0 ipv6 enable ipv6 address 2001::12:2/64 ipv6 address FE80::2 link-local ospfv3 1 area 0.0.0.0 # interface GigabitEthernet0/0/1 ip address 10.1.23.2 255.255.255.0 # interface LoopBack0 ip address 10.2.2.2 255.255.255.255 # interface Tunnel0/0/0 ipv6 enable ipv6 address 3333::1/64 tunnel-protocol gre # 或者 ipv6-ipv4 source 10.2.2.2 destination 10.4.4.4 # ospf 1 router-id 10.2.2.2 area 0.0.0.0 network 10.1.23.2 0.0.0.0 network 10.2.2.2 0.0.0.0 # ipv6 route-static 5555:: 64 Tunnel0/0/0 #

AR3:

interface GigabitEthernet0/0/0 ip address 10.1.23.3 255.255.255.0 # interface GigabitEthernet0/0/1 ip address 10.1.34.3 255.255.255.0 # interface LoopBack0 ip address 10.3.3.3 255.255.255.255 # ospf 1 router-id 10.3.3.3 area 0.0.0.0 network 10.1.23.3 0.0.0.0 network 10.1.34.3 0.0.0.0 network 10.3.3.3 0.0.0.0 #

AR4:

ipv6 # isis 1 is-level level-2 cost-style wide network-entity 49.0001.0000.0000.0004.00 # ipv6 enable topology standard ipv6 default-route-advertise always # interface GigabitEthernet0/0/0 ipv6 enable ipv6 address 2001::45:4/64 ipv6 address FE80::4 link-local isis ipv6 enable 1 # interface GigabitEthernet0/0/1 ip address 10.1.34.4 255.255.255.0 # interface LoopBack0 ip address 10.4.4.4 255.255.255.255 # interface Tunnel0/0/0 # 或者 ipv6-ipv4 ipv6 enable ipv6 address 3333::2/64 tunnel-protocol gre source 10.4.4.4 destination 10.2.2.2 # ospf 1 router-id 10.4.4.4 area 0.0.0.0 network 10.1.34.4 0.0.0.0 network 10.4.4.4 0.0.0.0 # ipv6 route-static 1111:: 64 Tunnel0/0/0

AR5:

ipv6 # isis 1 is-level level-2 cost-style wide network-entity 49.0001.0000.0000.0005.00 is-name R5 # ipv6 enable topology standard # interface GigabitEthernet0/0/0 ipv6 enable ipv6 address 2001::45:5/64 ipv6 address FE80::5 link-local isis ipv6 enable 1 # interface NULL0 # interface LoopBack0 ipv6 enable ipv6 address 5555::5/64 isis ipv6 enable 1 #

五、排错：

如果全局未开 ipv6 ，则 dis ipv6 int brief 时，会这样显示：

就是协议未起来