实验目的：

1、掌握PPP多链路捆绑的基本配置。

2、理解PPP多链路捆绑的功能。

实验拓扑：

实验步骤：

1、依据图中拓扑，为R1和R2的各个串口部署PPP封装，配置如下：

R1上

R1(config)#int s0/0

R1(config-if)#no shutdown

R1(config-if)#encapsulation ppp

R1(config-if)#int s0/1

R1(config-if)#no shutdown

R1(config-if)#encapsulation ppp

R1(config-if)#exit

R2上

R2(config)#int s0/0

R2(config-if)#no shutdown

R2(config-if)#encapsulation ppp

R2(config-if)#int s0/1

R2(config-if)#no shutdown

R2(config-if)#encapsulation ppp

R2(config-if)#exit

2、部署PPP捆绑，配置如下：

R1上

R1(config)#int s0/0

R1(config-if)#ppp multilink  

R1(config-if)#ppp multilink group 1 

R1(config-if)#int s0/1

R1(config-if)#ppp multilink

R1(config-if)#ppp multilink group 1

R1(config-if)#exit

R2上

R2(config)#int s0/0

R2(config-if)#ppp multilink

R2(config-if)#ppp multilink group 1

R2(config-if)#int s0/1

R2(config-if)#ppp multilink

R2(config-if)#ppp multilink group 1

R2(config-if)#exit

3、为逻辑捆绑口配置IP地址，如下：

R1(config)#int multilink 1 

R1(config-if)#ip add 12.1.1.1 255.255.255.0

R1(config-if)#exit


R2(config)#int multilink 1

R2(config-if)#ip add 12.1.1.2 255.255.255.0

R2(config-if)#exit

4、测试PPP多链路捆绑，如下：

①查看接口IP状态

R1#show interfaces multilink 1

Multilink1 is up, line protocol is up

  Hardware is multilink group interface

  Internet address is 12.1.1.1/24

  MTU 1500 bytes, BW 3088 Kbit,  DLY 100000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation PPP, LCP Open, multilink Open

  Open: IPCP, CDPCP, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 2 seconds on reset

  Last input 00:00:10, output never, output hang never

  Last clearing of "show interface" counters 00:10:04

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     32 packets input, 5126 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     32 packets output, 5496 bytes, 0 underruns

     0 output errors, 0 collisions, 2 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

可以看到，逻辑捆绑链路的带宽是原来Serial的2倍。

②查看接口IP信息

R1#show ip int brief

Interface                IP-Address     OK? Method Status   Protocol

Serial0/0               unassigned      YES unset  up       up     

Serial0/1               unassigned      YES unset  up       up     

Serial0/2               unassigned      YES unset  administratively down down   

Serial0/3               unassigned      YES unset  administratively down down   

Multilink1             12.1.1.1          YES  manual up            up

③测试连通性

R1#ping 12.1.1.2


Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 12.1.1.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/33/48 ms

测试成功，说明通过部署PPP多链路捆绑，可以实现链路冗余和带宽聚合，此实验完成。