MSR2600多WAN分流，互为备份的问题

S5120-28P交换机GE 1/0/24连接MSR2600GE0/4接口，交换机的配置如下

interface gigabitethernet 1/0/24

port link-type trunk

port trunk permit vlan 1 3 4

vlan 3

port gigabitethernet 1/0/1 to gigabitethernet 1/0/12

vlan 4

port gigabitethernet 1/0/13 to gigabitethernet 1/0/23

交换机上未配置其它。

现在PC1连接S5120 GE1/0/1口，可以正确获取IP并走路由器的dialer12上网，但如果将路由器的GE0/2关闭，也就是断开了这条外网，PC1就上不了网了。也就是说路由器下所有网段都只能走策略路由上网，并没有实现各外网线路的备份，还要在路由器上做什么样的配置，才能实现各外网线路互为备份呢？

MSR2600的配置如下：

#
 version 5.20, Release 2516P17
#
 sysname H3C
#
 clock timezone UTC add 08:00:00
#
 domain default enable system
#
 dns proxy enable
#
 telnet server enable
#
 dar p2p signature-file flash:/p2p_default.mtd
#
 ndp enable
#
 ntdp enable
#
 qos carl 1 destination-ip-address range 192.168.2.2 to 192.168.2.254 per-address shared-bandwidth
 qos carl 2 source-ip-address range 192.168.2.2 to 192.168.2.254 per-address shared-bandwidth
 qos carl 3 destination-ip-address range 192.168.4.2 to 192.168.4.254 per-address shared-bandwidth
 qos carl 4 source-ip-address range 192.168.4.2 to 192.168.4.254 per-address shared-bandwidth
 qos carl 5 destination-ip-address range 192.168.8.2 to 192.168.8.254 per-address shared-bandwidth
 qos carl 6 source-ip-address range 192.168.8.2 to 192.168.8.254 per-address shared-bandwidth
 qos carl 7 destination-ip-address range 192.168.16.2 to 192.168.16.254 per-address shared-bandwidth
 qos carl 8 source-ip-address range 192.168.16.2 to 192.168.16.254 per-address shared-bandwidth
#
 cluster enable
#
 port-security enable
#
 password-recovery enable
#
acl number 3003
 rule 0 permit ip source 192.168.2.0 0.0.0.255
acl number 3004
 rule 0 permit ip source 192.168.4.0 0.0.0.255
acl number 3008
 rule 0 permit ip source 192.168.8.0 0.0.0.255
acl number 3016
 rule 0 permit ip source 192.168.16.0 0.0.0.255
#
vlan 1
#
connection-limit policy 19
 connection-limit default action permit
 connection-limit default amount upper-limit 100 lower-limit 99
#
domain system
 access-limit disable
 state active
 idle-cut disable
 self-service-url disable
#
dhcp server ip-pool vlan1 extended
 network ip range 192.168.1.2 192.168.1.254
 network mask 255.255.255.0
 forbidden-ip 192.168.1.23
 gateway-list 192.168.1.1
 dns-list 202.96.64.68 202.96.69.38
#
dhcp server ip-pool vlan16 extended
 network ip range 192.168.16.2 192.168.16.200
 network mask 255.255.255.0
 gateway-list 192.168.16.1
 dns-list 202.96.64.68
#
dhcp server ip-pool vlan3 extended
 network ip range 192.168.2.2 192.168.2.200
 network mask 255.255.255.0
 gateway-list 192.168.2.1
 dns-list 202.96.64.68 202.96.69.38
#
dhcp server ip-pool vlan4 extended
 network ip range 192.168.4.2 192.168.4.200
 network mask 255.255.255.0
 gateway-list 192.168.4.1
 dns-list 202.96.64.68 202.96.69.38
#
dhcp server ip-pool vlan8 extended
 network ip range 192.168.8.2 192.168.8.200
 network mask 255.255.255.0
 gateway-list 192.168.8.1
 dns-list 202.96.64.68 202.96.69.38
#
policy-based-route CNC permit node 1
 if-match acl 3003
 apply output-interface Dialer12
policy-based-route CNC permit node 2
 if-match acl 3004
 apply output-interface Dialer13
policy-based-route CNC permit node 3
 if-match acl 3008
 apply output-interface Dialer10
policy-based-route CNC permit node 4
 if-match acl 3016
 apply output-interface Dialer11
#
user-group system
 group-attribute allow-guest
#
local-user admin
 password cipher $c$3$Q58BrJ76zoVGiUYjcVsGhI3MCYwuXa8T5ljM
 authorization-attribute level 3
 service-type telnet
 service-type web
local-user 1234
 password cipher $c$3$P0Xhf1w1RsVmdWCHuzKH/J4yWpZJTs3ms+5K
 authorization-attribute level 3
 service-type telnet terminal
 service-type web
#
cwmp
 undo cwmp enable
#
interface Aux0
 async mode flow
 link-protocol ppp
#
interface Cellular0/0
 async mode protocol
 link-protocol ppp
 tcp mss 1024
#
interface Dialer10
 nat outbound
 link-protocol ppp
 ppp chap user 123456
 ppp chap password cipher $c$3$NlCAvWpbfDmglf8j03pabnI2lAJUxvxXiw==
 ppp pap local-user  123456   password cipher $c$3$nSdTGqySqfD2E0jvz6frOAWhI55ratg5dg==
 ppp ipcp dns admit-any
 ppp ipcp dns request
 mtu 1492
 ip address ppp-negotiate
 tcp mss 1024
 dialer user username
 dialer-group 10
 dialer bundle 10
 qos car inbound carl 5 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 6 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface Dialer11
 nat outbound
 link-protocol ppp
 ppp chap user 123456
 ppp chap password cipher $c$3$GPrOJgGJv4pIIyFmolBjZ/ikLAoioA6QfA==
 ppp pap local-user 123456 password cipher $c$3$hARSFmuvtkW7TSaRWqEBdc6GexkIABfHvg==
 ppp ipcp dns admit-any
 ppp ipcp dns request
 mtu 1492
 ip address ppp-negotiate
 tcp mss 1024
 dialer user username
 dialer-group 11
 dialer bundle 11
 qos car inbound carl 7 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 8 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface Dialer12
 nat outbound
 link-protocol ppp
 ppp chap user 123456
 ppp chap password cipher $c$3$TjVs71oFIG1HhP0UNQ0SH8NY79kf+TSutg==
 ppp pap local-user  123456   password cipher $c$3$y82JE/MyLo2TS51dTez8c/rLSjT2qbdLTQ==
 ppp ipcp dns admit-any
 ppp ipcp dns request
 mtu 1492
 ip address ppp-negotiate
 tcp mss 1024
 dialer user username
 dialer-group 12
 dialer bundle 12
 qos car inbound carl 1 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 2 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface Dialer13
 nat outbound
 link-protocol ppp
 ppp chap user123456
 ppp chap password cipher $c$3$xM07Y/IjPmqfTm8Mfu9h/SPLH1kl/wy+rw==
 ppp pap local-user  123456   password cipher $c$3$IGDeupY1bBbIQvOd4JuMOqLGDoBTgkhOng==
 ppp ipcp dns admit-any
 ppp ipcp dns request
 mtu 1492
 ip address ppp-negotiate
 tcp mss 1024
 dialer user username
 dialer-group 13
 dialer bundle 13
 qos car inbound carl 3 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 4 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface NULL0
#
interface Vlan-interface1
 ip address 192.168.1.1 255.255.255.0
 tcp mss 1024
 dhcp server apply ip-pool vlan1
#
interface GigabitEthernet0/0
 port link-mode route
 nat outbound
 pppoe-client dial-bundle-number 10
 qos car inbound carl 5 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 6 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface GigabitEthernet0/1
 port link-mode route
 nat outbound
 pppoe-client dial-bundle-number 11
 qos car inbound carl 7 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 8 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface GigabitEthernet0/2
 port link-mode route
 nat outbound
 pppoe-client dial-bundle-number 12
 qos car inbound carl 1 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 2 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface GigabitEthernet0/3
 port link-mode route
 nat outbound
 pppoe-client dial-bundle-number 13
 qos car inbound carl 3 cir 90000 cbs 5625000 ebs 0 green pass red discard
 qos car outbound carl 4 cir 9000 cbs 562500 ebs 0 green pass red discard
#
interface GigabitEthernet0/4
 port link-mode route
#
interface GigabitEthernet0/4.3
 vlan-type dot1q vid 3
 ip address 192.168.2.1 255.255.255.0
 dhcp server apply ip-pool vlan3
 ip policy-based-route CNC
#
interface GigabitEthernet0/4.4
 vlan-type dot1q vid 4
 ip address 192.168.4.1 255.255.255.0
 dhcp server apply ip-pool vlan4
 ip policy-based-route CNC
#
interface GigabitEthernet0/5
 port link-mode route
#
interface GigabitEthernet0/5.8
 vlan-type dot1q vid 8
 ip address 192.168.8.1 255.255.255.0
 dhcp server apply ip-pool vlan8
 ip policy-based-route CNC
#
interface GigabitEthernet0/5.16
 vlan-type dot1q vid 16
 ip address 192.168.16.1 255.255.255.0
 dhcp server apply ip-pool vlan16
 ip policy-based-route CNC
#
interface GigabitEthernet0/6
 port link-mode bridge
#
interface GigabitEthernet0/7
 port link-mode bridge
#
interface GigabitEthernet0/8
 port link-mode bridge
#
interface GigabitEthernet0/9
 port link-mode bridge
#
 ip route-static 0.0.0.0 0.0.0.0 Dialer10
 ip route-static 0.0.0.0 0.0.0.0 Dialer11
 ip route-static 0.0.0.0 0.0.0.0 Dialer12
 ip route-static 0.0.0.0 0.0.0.0 Dialer13
#
 snmp-agent
 snmp-agent local-engineid 800063A20350DA00467971
 snmp-agent sys-info version all
#
 dhcp enable
#
 ntp-service unicast-server 202.112.29.82
#
 nat connection-limit-policy 19
#
 dialer-rule 10 ip permit
 dialer-rule 11 ip permit
 dialer-rule 12 ip permit
 dialer-rule 13 ip permit
#
 nms primary monitor-interface Dialer11
#
 load xml-configuration
#
 load tr069-configuration
#
user-interface tty 12
user-interface aux 0
user-interface vty 0 4
 authentication-mode scheme
#
return 

4条联通ADSL宽带分别连接MSR2600的GE0/0,GE0/1,GE0/2,GE0/3,通过配置子接口，划分4个IP段，192.168.2.0，192.168.4.0，192.168.8.0，192.168.16.0

设置策略路由使每个网段单走一条ADSL宽带上网