PingingLab-4.2 basic PPP Configuration

4.2 basic PPP Configuration

Purpose:

1. master the basic configurations of PPP.

2. Understand the PPP Encapsulation Format.

Tutorial topology:

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Tutorial steps:

1. Deploy the PPP encapsulation and IP address for the serial links 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) # ip address 12.1.1.1 255.255.255.0

R1 (config-if) # exit

On R2

R2 (config) # int s0/0

R2 (config-if) # no shutdown

R2 (config-if) # encapsulation ppp

R2 (config-if) # ip address 12.1.1.2 255.255.255.0

R2 (config-if) # exit

2. Check the interface encapsulation and test the direct connection connectivity.

R1 # show interfaces s0/0

Serial0/0 is up, line protocol is up

Hardware is M4T

Internet address is 12.1.1.1/24

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

Reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open

Open: IPCP, CDPCP, crc 16, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

Last input 00:00:25, output 00:00:08, output hang never

Last clearing of "show interface" counters 00:01:09

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

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations0/1/256 (active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1158 kilobits/sec

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

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

25 packets input, 1394 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

26 packets output, 1699 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

1 carrier transitionsDCD = upDSR = upDTR = upRTS = upCTS = up

As you can see, the router uses the PPP protocol for encapsulation and the interface is in normal state. Ping R2 on R1, as shown below:

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 = 20/25/40 MS

In this case, after the PPP encapsulation, the direct connection is normal.

3. view the PPP Encapsulation Format as follows:

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Compared with HDLC, PPP supports more functions, such as multi-protocol support, identity authentication, and link binding. It is compatible with different vendors and is a better Wan encapsulation protocol. This experiment is complete.

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