两种配置方法。一种是通过配置虚拟模板接口（Virtual-Template，VT）来实现MP，另一种是利用MP-Group接口实现MP。

方法一mp group：

interface Multilink1
 ip address 192.168.0.1 255.255.255.0
 ppp multilink
 multilink-group 1
!
interface Serial0/0
 no ip address
 encapsulation ppp
 serial restart-delay 0
 ppp multilink
 multilink-group 1
!
interface Serial0/1
 no ip address
 encapsulation ppp
 serial restart-delay 0
 ppp multilink
 multilink-group 1
!

注意事项：

1.输入ppp multilink group 1会自动转换为
ppp multilink
multilink-group 1

2.保障接口 no shutdown

参考资料：

http://dreamearth.blog.51cto.com/616542/149360

—————————————-

方法二：使用virtual-template：

multilink virtual-template 1
!
interface Virtual-Template1
 ip address 192.168.0.1 255.255.255.0
 ppp multilink
!
interface Serial0/0
 encapsulation ppp
 ppp multilink
!
interface Serial0/1
 encapsulation ppp
 ppp multilink

实验验证：

Router#sh ip int bri
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  unassigned      YES unset  up                    up     
Serial0/1                  unassigned      YES unset  up                    up       
Virtual-Access1            192.168.0.1     YES TFTP   up                    up     
Virtual-Template1          192.168.0.1     YES manual down                  down   
Router#sh int virtual-access 1
Virtual-Access1 is up, line protocol is up
  Hardware is Virtual Access interface
  Internet address is 192.168.0.1/24
  MTU 1500 bytes, BW 3088 Kbit, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set

切断一条链路后

Router#sh ip int bri  
Interface                  IP-Address      OK? Method Status                Protocol
Serial0/0                  unassigned      YES unset  up                    down   
Serial0/1                  unassigned      YES unset  up                    up      
Virtual-Access1            192.168.0.1     YES TFTP   up                    up     
Virtual-Template1          192.168.0.1     YES manual down                  down   

参考资料：

http://ltyluck.blog.51cto.com/170459/214877