CCNA LAB Practice - Integrated Services Digital Network (ISDN)

Lab # 21

Integrated Services Digital Network (ISDN)

Objective

ISDN defines a digital architecture that provides integrated voice and data capability using the public switched network.

ISDN specifies two standard access methods, BRI and PRI

BRI supports HDLC encapsulation by default. PPP encapsulation is more advantageous because of its LCP options such as PAP, CHAP, Multilink.

ISDN configuration is considered as Dial-on-Demand Routing:

It’s mean that

1. Connects when needed
2. Disconnects when finished

Dial-on-demand routing refers to a collection of Cisco features that allows two or more Cisco routers to establish a dynamic connection over simple dialup facilities.

ISDN Configuration Tasks are as follows,

1. Define Switch Type e.g., VN3
2. Assign Interesting Traffic definition e.g., IP Traffic
3. Mapping of Destination IP with Destination Telephone #.

Diagram

Procedure

1. Make a simple ISDN Call Configuration on Routers.
2. Verifying the R1’s configuration by pinging the R2.
3. Displays the status of an ISDN connection at Routers
4. Displays the status of an ISDN connection at Routers.
5. Displays the dialer information of an ISDN connection at Routers.
6. Displays statistics for the BRI interface configured at Routers.
7. To disconnect the current isdn session.
8. Displays statistics for the BRI interface configured at Router R1 after             disconnecting the line.

Configuration         

Step 1(A): Maka a simple ISDN Call Configuration on R1.

Router(config)#hostname R1

R1(config)#username R2 password cttc

R1(config)# isdn switch-type vn3

R1(config)#dialer-list 1 protocol ip permit

R1(config)#interface bri 0

R1(config-if)#ip address 15.0.0.1 255.0.0.0

R1(config-if)#no shutdown

R1(config-if)#encapsulation ppp

R1(config-if)#ppp authentication chap

R1(config-if)# dialer-group 1

R1(config-if)# dialer map ip 15.0.0.2 name R2 4315820

R1(config-if)#end

Step 1(B): Maka a simple ISDN Call Configuration on R2.

Router(config)#hostname R2

R2(config)#username R1 password cttc

R2(config)# isdn switch-type vn3

R2(config)#dialer-list 1 protocol ip permit

R2(config)#interface bri 0

R2(config-if)#ip address 15.0.0.2 255.0.0.0

R2(config-if)#no shutdown

R2(config-if)#encapsulation ppp

R2(config-if)#ppp authentication chap

R2(config-if)# dialer-group 1

R2(config-if)# dialer map ip 15.0.0.1 name R1 4315818

R2(config-if)#end

Step 2: Verifying the R1’s configuration by pinging the R2.

 

RouterA#ping 15.0.0.2

Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 36/38/40 ms

00:06:54: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 97 changed to up

00:06:56: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up

00:06:56: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 4315820

Step 3(A): Displays the status of an ISDN connection at Router R1.

R1#show isdn status

Global ISDN Switchtype = vn3

ISDN BRI0 interface

        dsl 0, interface ISDN Switchtype = vn3

    Layer 1 Status:

        ACTIVE

    Layer 2 Status:

        TEI = 97, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

    Layer 3 Status:

        1 Active Layer 3 Call(s)

    Activated dsl 0 CCBs = 1

        CCB:callid=0x8007, sapi=0x0, ces=0x1, B-chan=1

Total Allocated ISDN CCBs = 1

Step 3(B): Displays the status of an ISDN connection at Router R2.

R2#show isdn status

Global ISDN Switchtype = vn3

ISDN BRI0 interface

        dsl 0, interface ISDN Switchtype = vn3

    Layer 1 Status:

        ACTIVE

    Layer 2 Status:

        TEI = 106, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

    Layer 3 Status:

        1 Active Layer 3 Call(s)

    Activated dsl 0 CCBs = 1

        CCB:callid=0x7, sapi=0x0, ces=0x1, B-chan=1

Total Allocated ISDN CCBs = 1

Step 4(A): Displays the dialer information of an ISDN connection at Router R1.

R1#show dialer

BRI0 - dialer type = ISDN

Dial String      Successes   Failures    Last called   Last status

4315820                  7              0          00:00:16       successful

0 incoming call(s) have been screened.

0 incoming call(s) rejected for callback.

BRI0:1 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is data link layer up

Dial reason: ip (s=10.0.0.1, d=10.0.0.2)

Time until disconnect 105 secs

Connected to 4315820 (R2)

BRI0:2 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

Step 4(B): Displays the dialer information of an ISDN connection at Router R2.

R2#show dialer

BRI0 - dialer type = ISDN

Dial String      Successes   Failures    Last called   Last status

4315818                  0             0             never              -

0 incoming call(s) have been screened.

0 incoming call(s) rejected for callback.

BRI0:1 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is data link layer up

Time until disconnect 68 secs

Connected to 4315818 (R1)

BRI0:2 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

Step 5(A): Displays statistics for the BRI interface configured at Router R1.

R1#show int bri0

BRI0 is up, line protocol is up (spoofing)

  Hardware is BRI

  Internet address is 15.0.0.1/8

  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255

  Encapsulation PPP, loopback not set

<OutputOmitted>

Step 5(B): Displays statistics for the BRI interface configured at Router R2.

R2#show int bri0

BRI0 is up, line protocol is up (spoofing)

  Hardware is BRI

  Internet address is 15.0.0.2/8

  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255

  Encapsulation PPP, loopback not set

<OutputOmitted>

Step 6: To disconnect the current isdn session.

R1#clear int bri0

00:07:58: %ISDN-6-DISCONNECT: Interface BRI0:1  disconnected from 4315820 RouterB, call lasted 62 seconds

00:07:58: %LINK-3-UPDOWN: Interface BRI0:1, changed state to down

00:07:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to down

Step 7: Displays statistics for the BRI interface configured at Router R1 after

                 disconnecting the line.

R1#show int bri0

BRI0 is up (spoofing), line protocol is up (spoofing)

  Hardware is BRI

  Internet address is 10.0.0.1/8

  MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255

  Encapsulation PPP, loopback not set

<OutputOmitted>

 

Step 8: Verifying the ISDN Operations by other commands.

The show isdn active command displays current call information.

The show isdn history command displays the information of all calls.

The debug isdn q921 command shows ISDN Layer 2 messages.

The debug isdn q931 command shows ISDN call setup and teardown activity.

The debug ppp authentication command displays the PPP authentication protocol messages.

The debug ppp negotiation command displays information on PPP link establishment