PPP MP<多链路PPP>：
利用PPP MP捆绑多条链路，实现负载分担，增加带宽，链路备份：
[RTA]interface Mp-group 1
[RTA-Mp-group1]ip add 10.1.1.1 24
[RTA-Mp-group1]quit
[RTA]int s0/0
[RTA-Serial0/0]link-protocol ppp
[RTA-Serial0/0]ppp mp Mp-group 1
[RTA-Serial0/0]int s0/0/1
[RTA-Serial0/1]link-protocol ppp
[RTA-Serial0/1]ppp mp Mp-group 1
[RTB]interface Mp-group 1
[RTB-Mp-group1]ip add 10.1.1.2 24
[RTB]int s0/0
[RTB-Serial0/0]ppp mp Mp-group 1
[RTB-Serial0/0]link-protocol ppp
[RTB-Serial0/0]int s0/0/1
[RTB-Serial0/1]link-protocol ppp
[RTB-Serial0/1]ppp mp mp-group 1
此时两边已经互通：
[RTA]ping 10.1.1.2
PING 10.1.1.2: 56 data bytes, press CTRL_C to break
Request time out
Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=20 ms
Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=1 ms
Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=1 ms
Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=40 ms
--- 10.1.1.2 ping statistics ---
5 packet(s) transmitted
4 packet(s) received
20.00% packet loss
round-trip min/avg/max = 1/15/40 ms
[RTB]ping 10.1.1.1
PING 10.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=255 time=4 ms
Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=255 time=1 ms
Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=255 time=1 ms
Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=255 time=10 ms
Reply from 10.1.1.1: bytes=56 Sequence=5 ttl=255 time=1 ms
--- 10.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/3/10 ms
查看MP-GROUP信息：
[RTA]disp ppp mp
Mp-group is Mp-group1
max-bind: 16, min-fragment: 128
Bundle Multilink, 2 members, Master link is Mp-group1
Peer's endPoint descriptor: 10193f69cf36
Bundle Up Time: 2012/08/13 13:16:50:843
0 lost fragments, 0 reordered, 0 unassigned, 0 interleaved
Sequence: 0/0 rcvd/sent
The member channels bundled are:
Serial0/0/0 Up-Time:2012/08/13 13:16:50:843
Serial0/0/1 Up-Time:2012/08/13 13:17:08:78
