需要的位址和連接配接方式如圖所示，R1和R2之間的IPV4位址分别為10.1.1.1和20.1.1.1
配置tunnel0：
R2上的配置：
檢視接口位址配置和tunnel狀态：
驗證底層IPV4連通性和tunnel的連通性
去掉指向對端的loopback的靜态路由，R1，R2之間運作OSPF，檢視OSPF鄰居狀态，路由條目，兩端loopback是否互通：
附上R1，R2的配置：
R1#show running-config
Building configuration...
Current configuration : 1069 bytes
!
! Last configuration change at 16:19:44 CST Mon Jun 21 2021
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
hostname R1
boot-start-marker
boot-end-marker
no aaa new-model
clock timezone CST 8 0
ip cef
ipv6 unicast-routing
ipv6 cef
multilink bundle-name authenticated
interface Loopback0
no ip address
ipv6 address 2011:1:1:11::1/64
ipv6 ospf 1 area 0
interface Tunnel0
ipv6 address 2012:1:1:11::1/64
ipv6 enable
tunnel source Ethernet0/0
tunnel mode ipv6ip
tunnel destination 20.1.1.1
!
interface Ethernet0/0
ip address 10.1.1.1 255.255.255.0
interface Ethernet0/1
shutdown
interface Ethernet0/2
interface Ethernet0/3
ip forward-protocol nd
no ip http server
ip route 20.1.1.0 255.255.255.0 10.1.1.2
ipv6 router ospf 1
control-plane
line con 0
logging synchronous
line aux 0
line vty 0 4
login
end
R2#show running-config
! Last configuration change at 16:20:27 CST Mon Jun 21 2021
hostname R2
ipv6 address 2022:2:2:22::2/64
ipv6 address 2012:1:1:11::2/64
tunnel destination 10.1.1.1
ip address 20.1.1.1 255.255.255.0
ip route 10.1.1.0 255.255.255.0 20.1.1.2
R2#
......................................................................................................
分割線：
建立IPV6隧道采用unnumbered的方式：
首先看下思科官方文檔關于unnumbered的解釋: To enable IPv6 processing on an interface without assigning an explicit IPv6 address to the interface, use the ipv6 unnumbered command in interface configuration mode. To disable IPv6 on an unnumbered interface, use the no form of this command.
也就是采用unnumbered 後，無需在tunnel兩端使用固定的IPV6位址來建立
下面為配置方式和檢查指令：
分别在R1 R2上no掉靜态IP，然後啟用unnumbered到E0/0