PingingLab-4.5 PPP Multilink

4.5 PPP Multilink

Purpose:

1. master the basic configurations of PPP multi-link bundling.

2. Understand the multi-link binding feature of PPP.

Tutorial topology:

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Tutorial steps:

1. Deploy PPP encapsulation for each serial port of R1 and R2 Based on the topology shown in the figure. The configuration is as follows:

On R1

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

On R2

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. Deploy the PPP bundle. The configuration is as follows:

On R1

R1 (config) # int s0/0

R1 (config-if) # ppp multilink [PL1]

R1 (config-if) # ppp multilink group 1 [PL2]

R1 (config-if) # int s0/1

R1 (config-if) # ppp multilink

R1 (config-if) # ppp multilink group 1

R1 (config-if) # exit

On R2

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. Configure an IP address for the logical bundle port as follows:

R1 (config) # int multilink 1 [PL3]

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. Test the multi-link binding of PPP as follows:

① View the interface IP status

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, [PL4]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

We can see that the bandwidth of the logical binding link is twice that of the original Serial.

② View interface IP information

R1 # show ip int brief

InterfaceIP-AddressOK? Method StatusProtocol

Serial0/0UnassignedYES unsetUpUp

Serial0/1UnassignedYES unsetUpUp

Serial0/2UnassignedYES unsetAdministratively down

Serial0/3UnassignedYES unsetAdministratively down

Multilink112.1.1.1YESManual upUp

③ Test connectivity

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

If the test is successful, it means that the PPP multi-link bundle can be deployed to achieve link redundancy and bandwidth aggregation. This experiment is completed.

[PL1]Enable PPP multi-link binding.

[PL2]Put the interface into the bundle group. The group here is used to distinguish multiple local bundle groups, which are local identifiers.

[PL3]Go to the logical port and assign an IP address to it.

[PL4]The Serial port is 1544 kbit, and the logical port is exactly twice that.

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