.RT1串行链路、RT2串行链路、FW1、AC1之间分别运行RIP和RIPng协议，FW1、RT1、RT2的RIP和RIPng发布loopback2地址路由，AC1 RIP发布loopback2地址路由，AC1 RIPng采用route-map匹配prefix-list重发布loopback2地址路由。RT1配置offset值为3的路由策略，实现RT1-S1/0_RT2-S1/1为主链路，RT1-S1/1_RT2-S1/0为备份链路，ipv4的ACL名称为AclRIP，ipv6的ACL名称为AclRIPng。RT1的S1/0与RT2的S1/1之间采用chap双向认证，用户名为对端设备名称，密码为Key-1122。

以下是配置示例：

在RT1上的配置：

interface Serial1/0
 ip address 10.1.1.1 255.255.255.0
 ipv6 address 2001:DB8:10:1::1/64
 encapsulation ppp
 ppp authentication chap
 ppp chap hostname RT2
 ppp chap password Key-1122
 no shutdown

interface Serial1/1
 ip address 10.1.2.1 255.255.255.0
 ipv6 address 2001:DB8:10:2::1/64
 encapsulation ppp
 ppp authentication chap
 ppp chap hostname RT2
 ppp chap password Key-1122
 no shutdown

interface Loopback2
 ip address 192.168.2.1 255.255.255.0
 ipv6 address 2001:DB8:2::1/64

access-list 101 permit ip host 192.168.2.1 any
access-list 102 permit ipv6 host 2001:DB8:2::1 any

router rip
 version 2
 network 192.168.2.0
 default-metric 1
 passive-interface default
 no passive-interface Serial1/0
 no passive-interface Serial1/1

router ripng
 version 2
 network 2001:DB8:2::/64
 default-metric 1
 distribute-list prefix-list RIPng out
 passive-interface default
 no passive-interface Serial1/0
 no passive-interface Serial1/1

ipv6 prefix-list RIPng seq 10 permit 2001:DB8:2::/64
ipv6 prefix-list RIPng seq 20 deny ::/0 le 128

route-map RIPng permit 10
 match ipv6 address prefix-list RIPng
 set metric 3

在RT2上的配置：

interface Serial1/0
 ip address 10.1.2.2 255.255.255.0
 ipv6 address 2001:DB8:10:2::2/64
 encapsulation ppp
 ppp authentication chap
 ppp chap hostname RT1
 ppp chap password Key-1122
 no shutdown

interface Serial1/1
 ip address 10.1.1.2 255.255.255.0
 ipv6 address 2001:DB8:10:1::2/64
 encapsulation ppp
 ppp authentication chap
 ppp chap hostname RT1
 ppp chap password Key-1122
 no shutdown

interface Loopback2
 ip address 192.168.2.2 255.255.255.0
 ipv6 address 2001:DB8:2::2/64

router rip
 version 2
 network 192.168.2.0
 default-metric 1
 passive-interface default
 no passive-interface Serial1/0
 no passive-interface Serial1/1

router ripng
 version 2
 network 2001:DB8:2::/64
 default-metric 1
 distribute-list prefix-list RIPng out
 passive-interface default
 no passive-interface Serial1/0
 no passive-interface Serial1/1

ipv6 prefix-list RIPng seq 10 permit 2001:DB8:2::/64
ipv6 prefix-list RIPng seq 20 deny ::/0 le 128

route-map RIPng permit 10
 match ipv6 address prefix-list RIPng
 set metric 3

在FW1上的配置：

interface GigabitEthernet0/0
 ip address 10.1.3.1 255.255.255.0
 ipv6 address 2001:DB8:10:3::1/64

interface Loopback2
 ip address 192.168.2.3 255.255.255.0
 ipv6 address 2001:DB8:2::3/64

router rip
 version 2
 network 192.168.2.0
 default-metric 1
 passive-interface default
 no passive-interface GigabitEthernet0/0

router ripng
 version 2
 network 2001:DB8:2::/64
 default-metric 1
 distribute-list prefix-list RIPng out
 passive-interface default
 no passive-interface GigabitEthernet0/0

在AC1上的配置：

interface GigabitEthernet0/0
 ip address 10.1.4.1 255.255.255.0
 ipv6 address 2001:DB8:10:4::1/64

interface Loopback2
 ip address 192.168.2.4 255.255.255.0
 ipv6 address 2001:DB8:2::4/64

router rip
 version 2
 network 192.168.2.0
 default-metric 1
 passive-interface default
 no passive-interface GigabitEthernet0/0

router ripng
 version 2
 network 2001:DB8:2::/64
 default-metric 1
 redistribute rip metric 3 route-map RIPng
 passive-interface default
 no passive-interface GigabitEthernet0/0

ipv6 prefix-list RIPng seq 10 permit 2001:DB8:2::/64
ipv6 prefix-list RIPng seq 20 deny ::/0 le 128

route-map RIPng permit 10
 match ipv6 address prefix-list RIPng
 set metric 3

注意：以上配置仅供参考，实际配置需要根据网络拓扑和需求进行调整。