The document discusses the configurations and protocols for communication between Data Communication Equipment (DCE) and Data Termination Equipment (DTE) via Point-to-Point Protocol (PPP) and High-Level Data Link Control (HDLC). It includes examples of network setups, specifically in Hyderabad and Chennai, showcasing configuration commands for routers and their interfaces. Additionally, the document provides insights into verifying connection statuses and managing the communication setup through specific commands.

1. 1

2. Encapsulation
PPP
• Point to Point
Protocol
• Open Standard
HDLC
• High level Data link
Control
• Vendor proprietary
Protocol (works with
Protocol (works with
same and different
same company Router
company Routers i.e.
only, i.e. Cisco-Cisco,
Cisco–Nortel, Cisco–
Nortel-Nortel, etc.)
Multicom.
• Supports
Authentication
• Supports Compression
• No Support for
Authentication
• No Support for
Compression
2

3. Device Classification
DCE
• Data Communication
Equipment
• Generate clocking
(i.e. Speed).
DTE
• Data Termination
Equipment
• Accept clocking
(i.e. Speed).
• Master
• Slave
• Example of DCE device in
• Example of DTE device in
Leased line setup : V.35 &
Leased line setup : Router
G.703 Modem & Exchange
(Modem & MUX)
• Example of DCE device in
Dial up setup : Dialup
• Example of DTE device in
Dial up setup : Computer
Modem
3

4. V.35 Modem
E0
V.35
192.168.1.150 Cable
E0
192.168.2.150
V.35
Cable
2 pair of
Copper Wire
LAN - 192.168.1.0/24
LAN - 192.168.2.0/24
HYDERABAD
OFFICE
G.703
Modem
HYDERABAD
MUX
CHENNAI
OFFICE
EXCHANGE
G.703
Modem
4
Fiber Optic Cable
CHENNAI
MUX

5. Lab Setup
Wan Representation
S0
HYD
S1
CHE
• A Back to Back Cable is used which emulates the
copper wire, modems and MUX , the complete
exchange setup.
• Without DCE & DTE device communication is not
possible.
5

6. V.35 Back to Back Cable
6

7. Lab Setup
DCE Interface
DTE Interface
S0
HYD
S1
CHE
• Can 2 DTE devices communicate?
Answer : No
For Lab Setup : convert one Router to act as a DCE
device.
The cable will have a DCE end and a DTE end
• To check : Look for the label on the cable
• The DCE end of the cable connected to the router’s
interface should be made as DCE by giving a
CLOCKRATE command in the interface mode.
7

8. 10.0.0.1/8
S0
HYD
11.0.0.1/8
S0
S1
10.0.0.2/8
CHE
E0
192.168.1.150/24
LAN - 192.168.1.0/24
17.0.0.1/8
S0
S1
11.0.0.2/8
LAN - 192.168.2.0/24
S0
16.0.0.1/8
JAI
E0
192.168.9.150/24
LAN - 192.168.9.0/24
LAN - 192.168.4.0/24
S0
15.0.0.1/8
LAN - 192.168.10.0/24
SUR
E0
192.168.7.150/24
13.0.0.2/8
S1
S0
14.0.0.1/8
E0
192.168.6.150/24
LAN - 192.168.6.0/24
BOM
E0
192.168.5.150/24
LAN - 192.168.5.0/24
20.0.0.1/8
S0
S1
19.0.0.2/8
E0
192.168.10.150/24
E0
192.168.4.150/24
14.0.0.2/8
S1
19.0.0.1/8
S0
KOL
PUNE
E0
192.168.3.150/24
LAN - 192.168.7.0/24
18.0.0.1/8
S0
S1
18.0.0.2/8
S1
12.0.0.2/8
15.0.0.2/8
S1
LAN - 192.168.8.0/24
DEL
13.0.0.1/8
S0
LAN - 192.168.3.0/24
16.0.0.2/8
S1
AGRA
BAN
E0
192.168.2.150/24
E0
192.168.8.150/24
17.0.0.2/8
S1
12.0.0.1/8
S0
SRI
S1
20.0.0.2/8
GOA
E0
192.168.11.150/24
LAN - 192.168.11.0/24
E0
192.168.12.150/24
8
LAN - 192.168.12.0/24

9. Wan Interface Configuration
10.0.0.1/8
S0
HYD
E0
192.168.1.150/24
LAN - 192.168.1.0/24
S1
10.0.0.2/8
CHE
E0
192.168.2.150/24
LAN - 192.168.2.0/24
9

10. 10

11. 11

12. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.1.150
Connecting .....
================================
Welcome to Hyderabad Router
================================
User Access Verification
password : ****
Hyderabad> enable
password : ****
Hyderabad# show controllers S 0
HD unit 0, idb = 0xB7574, driver structure at 0xBC2F8
buffer size 1524 HD unit 0, V.35 DCE cable
cpb = 0x1, eda = 0x4940, cda = 0x4800
RX ring with 16 entries at 0x4014800
00 bd_ptr=0x4800 pak=0x0BE054 ds=0x401B6A8 status=80 pak_size=0
01 bd_ptr=0x4814 pak=0x0BED04 ds=0x401E5B0 status=80 pak_size=0
02 bd_ptr=0x4828 pak=0x0BE224 ds=0x401BD60 status=80 pak_size=0
03 bd_ptr=0x483C pak=0x0BEED4 ds=0x401EC68 status=80 pak_size=0
--More--
12

13. 04 bd_ptr=0x4850 pak=0x0BEB34 ds=0x401DEF8
05 bd_ptr=0x4864 pak=0x0BF0A4 ds=0x401F320
06 bd_ptr=0x4878 pak=0x0BDE84 ds=0x401AFF0
07 bd_ptr=0x488C pak=0x0BE794 ds=0x401D188
08 bd_ptr=0x48A0 pak=0x0BDCB4 ds=0x401A938
09 bd_ptr=0x48B4 pak=0x0BE964 ds=0x401D840
10 bd_ptr=0x48C8 pak=0x0BE3F4 ds=0x401C418
11 bd_ptr=0x48DC pak=0x0BDAE4 ds=0x401A280
12 bd_ptr=0x48F0 pak=0x0BD914 ds=0x4019BC8
13 bd_ptr=0x4904 pak=0x0BD744 ds=0x4019510
14 bd_ptr=0x4918 pak=0x0BD574 ds=0x4018E58
15 bd_ptr=0x492C pak=0x0BD3A4 ds=0x40187A0
16 bd_ptr=0x4940 pak=0x0BD1D4 ds=0x40180E8
cpb = 0x1, eda = 0x5014, cda = 0x5014
TX ring with 2 entries at 0x4015000
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
status=80
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
00 bd_ptr=0x5000 pak=0x000000 ds=0x4031838 status=80 pak_size=22
01 bd_ptr=0x5014 pak=0x000000 ds=0x000000 status=80 pak_size=0
02 bd_ptr=0x5028 pak=0x000000 ds=0x000000 status=80 pak_size=0
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors
13
Hyderabad#

14. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.2.150
Connecting .....
================================
Welcome to Chennai Router
================================
User Access Verification
password : ****
Chennai> enable
password : ****
Chennai# show controllers S 1
HD unit 0, idb = 0xB7574, driver structure at 0xBC2F8
buffer size 1524 HD unit 0, V.35 DTE cable
cpb = 0xE1, eda = 0x4814, cda = 0x4828
RX ring with 16 entries at 0xE14800
00 bd_ptr=0x4800 pak=0x0BEB34 ds=0xE1DEF8 status=80 pak_size=13
01 bd_ptr=0x4814 pak=0x0BF0A4 ds=0xE1F320 status=80 pak_size=13
02 bd_ptr=0x4828 pak=0x0BED04 ds=0xE1E5B0 status=80 pak_size=0
03 bd_ptr=0x483C pak=0x0BE964 ds=0xE1D840 status=80 pak_size=0
--More--
14

15. 04 bd_ptr=0x4850 pak=0x0BE794 ds=0xE1D188 status=80
05 bd_ptr=0x4864 pak=0x0BE5C4 ds=0xE1CAD0 status=80
06 bd_ptr=0x4878 pak=0x0BE3F4 ds=0xE1C418 status=80
07 bd_ptr=0x488C pak=0x0BE224 ds=0xE1BD60 status=80
08 bd_ptr=0x48A0 pak=0x0BE054 ds=0xE1B6A8 status=80
09 bd_ptr=0x48B4 pak=0x0BDE84 ds=0xE1AFF0 status=80
10 bd_ptr=0x48C8 pak=0x0BDCB4 ds=0xE1A938 status=80
11 bd_ptr=0x48DC pak=0x0BDAE4 ds=0xE1A280 status=80
12 bd_ptr=0x48F0 pak=0x0BD914 ds=0xE19BC8 status=80
13 bd_ptr=0x4904 pak=0x0BD744 ds=0xE19510 status=80
14 bd_ptr=0x4918 pak=0x0BD574 ds=0xE18E58 status=80
15 bd_ptr=0x492C pak=0x0BD3A4 ds=0xE187A0 status=80
16 bd_ptr=0x4940 pak=0x0BD1D4 ds=0xE180E8 status=80
cpb = 0xE1, eda = 0x5028, cda = 0x5028
TX ring with 2 entries at 0xE15000
00 bd_ptr=0x5000 pak=0x000000 ds=0xE31964 status=80
01 bd_ptr=0x5014 pak=0x000000 ds=0xE31964 status=80
02 bd_ptr=0x5028 pak=0x000000 ds=0x000000 status=80
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
0 residual bit errors
Chennai#
15
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=0
pak_size=13
pak_size=13
pak_size=0

16. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.1.150
Connecting .....
================================
Configuring Serial interface
Configuring Serial interface
Welcome to Hyderabad Router
Router(config)#interface serial <no>
Router(config)#interface serial <no>
================================
Router(config-if)#ip address <address> <mask>
Router(config-if)#ip address <address> <mask>
User Access Verification
Router(config-if)#no shutdown
password : **** Router(config-if)#no shutdown
Router(config-if)#clockrate <clock rate>
Hyderabad> enable
Router(config-if)#clockrate <clock rate>
password : **** Router(config-if)#encapsulation {ppp|hdlc}
Router(config-if)#encapsulation {ppp|hdlc}
Hyderabad# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Hyderabad(config)# interface serial 0
Hyderabad(config-if)# ip address 10.0.0.1 255.0.0.0
Hyderabad(config-if)# no shutdown
Hyderabad(config-if)# clockrate 64000
Hyderabad(config-if)# encapsulation hdlc
Hyderabad(config-if)# exit
Hyderabad(config)#
16

17. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.2.150
Connecting .....
================================
Configuring Serial interface
Welcome to Chennai RouterConfiguring Serial interface
Router(config)#interface serial <no>
Router(config)#interface serial <no>
================================
Router(config-if)#ip address <address> <mask>
Router(config-if)#ip address <address> <mask>
User Access Verification
Router(config-if)#no shutdown
password : **** Router(config-if)#no shutdown
Chennai> enable Router(config-if)#clockrate <clock rate>
Router(config-if)#clockrate <clock rate>
password : **** Router(config-if)#encapsulation {ppp|hdlc}
Router(config-if)#encapsulation {ppp|hdlc}
Chennai# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Chennai(config)# interface serial 1
Chennai(config-if)# ip address 10.0.0.2 255.0.0.0
Chennai(config-if)# no shutdown
Chennai(config-if)# encapsulation hdlc
Chennai(config-if)# exit
Chennai(config)#
17

18. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.1.150
Connecting .....
================================
Welcome to Hyderabad Router
================================
User Access Verification
password : ****
Hyderabad> enable
password : ****
Hyderabad# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Hyderabad(config)# interface serial 0
Hyderabad(config-if)# ip address 10.0.0.1 255.0.0.0
Hyderabad(config-if)# no shutdown
Hyderabad(config-if)# clockrate 64000
Hyderabad(config-if)# encapsulation hdlc
Hyderabad(config-if)# exit
Hyderabad(config)# exit
Hyderabad# show int s0
18

19. Serial0 is up, line protocol is up
Hardware is HD64570
Internet address is 10.0.0.1/8
MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usec,rely 255/255,load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:05:29, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max
1.Serial0 is up, line protocol is up active/max total)
Serial0 is up, line protocol is up
1. Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
Implies, all rate 0 bits/sec, 0 the connectivity are
5 minute output configurations and the connectivity are
Implies, all configurations and packets/sec
997 packets input, 20161 bytes, 0 no buffer
Received 875 broadcasts, 0 runts, 0 giants, 0 throttles
fine.
fine.
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
899 packets output, 24785 bytes, 0 underruns
0 output errors, 0 collisions, 132 interface resets
0 output buffer failures, 0 output buffers swapped out
325 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
Hyderabad# show int s0
19

20. Serial0 is administratively down, line protocol is down
Hardware is HD64570
Internet address is 10.0.0.1/8
MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usec,rely 255/255,load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:01:27, output 00:01:20, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
2.Serial0 is administratively down, line protocol is down
Serial0 is administratively down, line protocol is down
2. Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
Implies, No rate 0 bits/sec, 0 packets/sec
5 minute outputShut (Layer1 command) has not been
Implies, No Shut (Layer1 command) has not been
995 packets input, 20133 bytes, 0 no buffer
Received the local routers interface.
given on 873 broadcasts, 0 runts, 0 giants, 0 throttles
given on the local routers interface.
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
896 packets output, 24163 bytes, 0 underruns
0 output errors, 0 collisions, 131 interface resets
0 output buffer failures, 0 output buffers swapped out
325 carrier transitions
DCD=up DSR=up DTR=down RTS=down CTS=up
Hyderabad# show int s0
20

21. Serial0 is up, line protocol is down
Hardware is HD64570
Internet address is 10.0.0.1/8
MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usec,rely 255/255,load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:07:56, output 00:00:05, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: up, line protocol is down
3. Serial0 is 0/1000/64/0 (size/max total/threshold/drops)
3. Serial0 is up, line protocol is downactive/max total)
Conversations 0/1/256 (active/max
Reserved Conversations 0/0 (allocated/max allocated)
Implies Encapsulation or 0 packets/sec
5 minute input rate 0 bits/sec,Clock Rate (Layer2
Implies ,, Encapsulation or Clock Rate (Layer2
5 minute output rate 0 bits/sec, 0 packets/sec
1028 packets input, 20595 bytes,
no buffer
commands) have not been given or encapsulation on
commands) have not been given0or encapsulation on
Received 906 broadcasts, 0 runts, 0 giants, 0 throttles
0 input routers are different.
both theerrors, 0are different. 0 overrun, 0 ignored, 0 abort
the routers CRC, 0 frame,
bothpackets output, 25475 bytes, 0 underruns
917
0 output errors, 0 collisions, 138 interface resets
0 output buffer failures, 0 output buffers swapped out
341 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
Hyderabad# show int s0
21

22. Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is 10.0.0.1/8
MTU 1500 bytes,BW 1544 Kbit,DLY 20000 usec,rely 255/255,load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:12:40, output 00:00:08, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: down, line protocol is total/threshold/drops)
4. Serial0 is 0/1000/64/0 (size/max down
4. Serial0 is down, line protocol is down
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Implies No Shut bits/sec, 0 packets/sec
5 minute input rate 0 has not been given on the remote
Implies ,, No Shut has not been given on the remote
5 minute output rate 0 bits/sec, 0 packets/sec
1088 packets input, some problem with the
routers interface or some problem with the physical
routers interface or 21435 bytes, 0 no buffer physical
Received 966 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors,
connectivity. 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
connectivity.
945 packets output, 26091 bytes, 0 underruns
0 output errors, 0 collisions, 147 interface resets
0 output buffer failures, 0 output buffers swapped out
370 carrier transitions
DCD=down DSR=down DTR=up RTS=up CTS=down
Hyderabad#
22

23. 23