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  • Шаг 2: Измените инкапсуляцию на PPP. Для изменения инкапсуляции HDLC на PPP введите команду encapsulation ppp

  • encapsulation ppp

  • Шаг 3: Намеренно разорвите последовательное подключение. Выполните команды debug ppp

  • Методические указания к ЛР-2. Правила выполнения и проведения лабораторных работ 5 Критерии оценки лабораторных работ 5


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    Часть 2: Настройка инкапсуляции PPP


    Шаг 1: Отобразите инкапсуляцию, используемую в последовательном интерфейсе по умолчанию.

    На маршрутизаторах выполните команду show interfaces serial идентификатор_интерфейса для отображения текущей инкапсуляции, используемой в последовательном интерфейсе.

    Branch1# show interfaces s0/0/0

    Serial0/0/0 is up, line protocol is up

    Hardware is WIC MBRD Serial

    Internet address is 10.1.1.1/30 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set

    Keepalive set (10 sec)

    Last input 00:00:02, output 00:00:05, output hang never

    Last clearing of "show interface" counters never

    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

    1003 packets input, 78348 bytes, 0 no buffer

    Received 527 broadcasts (0 IP multicasts)

    0 runts, 0 giants, 0 throttles

    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

    1090 packets output, 80262 bytes, 0 underruns

    0 output errors, 0 collisions, 3 interface resets

    0 unknown protocol drops

    0 output buffer failures, 0 output buffers swapped out

    2 carrier transitions

    DCD=up DSR=up DTR=up RTS=up CTS=up

    Укажите тип инкапсуляции, используемой в последовательном интерфейсе по умолчанию, для маршрутизатора Cisco. __________________________________

    Шаг 2: Измените инкапсуляцию на PPP.

    1. Для изменения инкапсуляции HDLC на PPP введите команду encapsulation ppp на интерфейсе S0/0/0 маршрутизатора «Филиал 1».

    Branch1(config)# interface s0/0/0

    Branch1(config-if)# encapsulation ppp

    Branch1(config-if)#

    Jun 19 06:02:33.687: %OSPF-5-ADJCHG: Process 1, Nbr 209.165.200.225 on Serial0/0/0

    from FULL to DOWN, Neighbor Down: Interface down or detached



    Branch1(config-if)#

    Jun 19 06:02:35.687: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,

    changed state to down



    1. Введите команду для отображения состояния канала и протокола канала для интерфейса S0/0/0 маршрутизатора «Филиал 1». Задокументируйте выполненную команду. Укажите текущее состояние интерфейса S0/0/0.

    _____________________________________________________________________________

    1. Для исправления разночтений в настройках инкапсуляции для последовательного интерфейса ведите команду encapsulation ppp на интерфейсе S0/0/0 для маршрутизатора Central.

    Central(config)# interface s0/0/0

    Central(config-if)# encapsulation ppp

    Central(config-if)#

    .Jun 19 06:03:41.186: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,




    changed state to up






    .Jun 19 06:03:41.274: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.1.1 on Serial0/0/0 from

    LOADING to FULL, Loading Done



    1. Убедитесь, что интерфейс S0/0/0 как на маршрутизаторе «Филиал 1», так и на маршрутизаторе «Главный» находится в активном состоянии и настроен с инкапсуляцией PPP.

    Укажите состояние протокола PPP (LCP). ____________

    Укажите, согласование каких протоколов NCP было выполнено.

    _____________________________________________________________________________

    Branch1# show interfaces s0/0/0

    Serial0/0/0 is up, line protocol is up

    Hardware is WIC MBRD Serial

    Internet address is 10.1.1.1/30 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open

    Open: IPCP, CDPCP, loopback not set

    Keepalive set (10 sec)

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

    Last clearing of "show interface" counters 00:03:58

    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

    77 packets input, 4636 bytes, 0 no buffer

    Received 0 broadcasts (0 IP multicasts)

    0 runts, 0 giants, 0 throttles

    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

    117 packets output, 5800 bytes, 0 underruns

    0 output errors, 0 collisions, 8 interface resets

    22 unknown protocol drops

    0 output buffer failures, 0 output buffers swapped out

    18 carrier transitions

    DCD=up DSR=up DTR=up RTS=up CTS=up

    Central# show interfaces s0/0/0

    Serial0/0/0 is up, line protocol is up

    Hardware is WIC MBRD Serial

    Internet address is 10.1.1.2/30 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open

    Open: IPCP, CDPCP, loopback not set

    Keepalive set (10 sec)

    Last input 00:00:02, output 00:00:03, output hang never

    Last clearing of "show interface" counters 00:01:20

    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

    41 packets input, 2811 bytes, 0 no buffer

    Received 0 broadcasts (0 IP multicasts)

    0 runts, 0 giants, 0 throttles

    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

    40 packets output, 2739 bytes, 0 underruns

    0 output errors, 0 collisions, 0 interface resets

    0 unknown protocol drops

    0 output buffer failures, 0 output buffers swapped out

    0 carrier transitions

    DCD=up DSR=up DTR=up RTS=up CTS=up

    Шаг 3: Намеренно разорвите последовательное подключение.

    1. Выполните команды debug ppp, чтобы понаблюдать за влиянием изменения настройки PPP на маршрутизаторы «Филиал 1» и «Главный».

    Branch1# debug ppp negotiation

    PPP protocol negotiation debugging is on

    Branch1# debug ppp packet PPP packet display debugging is on

    Central# debug ppp negotiation

    PPP protocol negotiation debugging is on

    Central# debug ppp packet

    PPP packet display debugging is on

    1. Наблюдайте за сообщениями команды debug PPP при проходе трафика по последовательному каналу между маршрутизаторами «Филиал 1» и «Главный».

    Branch1#

    Jun 20 02:20:45.795: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 84

    Jun 20 02:20:49.639: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 84 link[ip]

    Jun 20 02:20:50.147: Se0/0/0 LCP-FS: I ECHOREQ [Open] id 45 len 12 magic 0x73885AF2

    Jun 20 02:20:50.147: Se0/0/0 LCP-FS: O ECHOREP [Open] id 45 len 12 magic 0x8CE1F65F

    Jun 20 02:20:50.159: Se0/0/0 LCP: O ECHOREQ [Open] id 45 len 12 magic 0x8CE1F65F

    Jun 20 02:20:50.159: Se0/0/0 LCP-FS: I ECHOREP [Open] id 45 len 12 magic 0x73885AF2

    Jun 20 02:20:50.159: Se0/0/0 LCP-FS: Received id 45, sent id 45, line up

    Central#

    Jun 20 02:20:49.636: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 84

    Jun 20 02:20:50.148: Se0/0/0 LCP: O ECHOREQ [Open] id 45 len 12 magic 0x73885AF2

    Jun 20 02:20:50.148: Se0/0/0 LCP-FS: I ECHOREP [Open] id 45 len 12 magic 0x8CE1F65F

    Jun 20 02:20:50.148: Se0/0/0 LCP-FS: Received id 45, sent id 45, line up

    Jun 20 02:20:50.160: Se0/0/0 LCP-FS: I ECHOREQ [Open] id 45 len 12 magic 0x8CE1F65F

    Jun 20 02:20:50.160: Se0/0/0 LCP-FS: O ECHOREP [Open] id 45 len 12 magic 0x73885AF2

    Jun 20 02:20:55.552: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 84 link[ip]

    1. Разорвите последовательное подключение путем возвращения HDLC в качестве инкапсуляции для последовательного интерфейса S0/0/0 маршрутизатора «Филиал 1». Запишите команду, использованную для изменения инкапсуляции на HDLC.

    _____________________________________________________________________________

    1. Наблюдайте за сообщениями команды debug PPP на маршрутизаторе «Филиал 1».

    Последовательное подключение завершено, и протокол линии связи не функционирует. Маршрут к 10.1.1.2 («Главный») удалён из таблицы маршрутизации.

    Jun 20 02:29:50.295: Se0/0/0 PPP DISC: Lower Layer disconnected Jun 20 02:29:50.295: PPP: NET STOP send to AAA.

    Jun 20 02:29:50.299: Se0/0/0 IPCP: Event[DOWN] State[Open to Starting]

    Jun 20 02:29:50.299: Se0/0/0 IPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 02:29:50.299: Se0/0/0 CDPCP: Event[DOWN] State[Open to Starting]

    Jun 20 02:29:50.299: Se0/0/0 CDPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 02:29:50.29

    Branch1(config-if)#9: Se0/0/0 LCP: O TERMREQ [Open] id 7 len 4

    Jun 20 02:29:50.299: Se0/0/0 LCP: Event[CLOSE] State[Open to Closing]

    Jun 20 02:29:50.299: Se0/0/0 PPP: Phase is TERMINATING

    Jun 20 02:29:50.299: Se0/0/0 Deleted neighbor route from AVL tree: topoid 0, address

    10.1.1.2

    Jun 20 02:29:50.299: Se0/0/0 IPCP: Remove route to 10.1.1.2

    Jun 20 02:29:50.299: Se0/0/0 LCP: Event[DOWN] State[Closing to Initial]

    Jun 20 02:29:50.299: Se0/0/0 PPP: Phase is DOWN

    Branch1(config-if)#

    Jun 20 02:30:17.083: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,




    changed state to down






    Jun 20 02:30:17.083: %OSPF-5-ADJCHG: Process 1, Nbr 209.165.200.225 on Serial0/0/0

    from FULL to DOWN, Neighbor Down: Interface down or detached



    e. Наблюдайте за сообщениями команды debug PPP на маршрутизаторе «Главный». Маршрутизатор «Главный» продолжает попытки установить подключение к маршрутизатору «Филиал 1», как видно из сообщений команды debug. Если интерфейсы не могут установить подключение, интерфейсы снова прекращают работу. Кроме того, OSPF не может сформировать отношения смежности с соседним с ним устройством вследствие несоответствия инкапсуляции для последовательного канала.

    Jun 20 02:29:50.296: Se0/0/0 PPP: Sending cstate DOWN notification

    Jun 20 02:29:50.296: Se0/0/0 PPP: Processing CstateDown message

    Jun 20 02:29:50.296: Se0/0/0 PPP DISC: Lower Layer disconnected Jun 20 02:29:50.296: PPP: NET STOP send to AAA.

    Jun 20 02:29:50.296: Se0/0/0 IPCP: Event[DOWN] State[Open to Starting]

    Jun 20 02:29:50.296: Se0/0/0 IPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 02:29:50.296: Se0/0/0 CDPCP: Event[DOWN] State[Open to Starting]

    Jun 20 02:29:50.296: Se0/0/0 CDPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 02:29:50.296: Se0/0/0 LCP: O TERMREQ [Open] id 2 len 4

    Jun 20 02:29:50.296: Se0/0/0 LCP: Event[CLOSE] State[Open to Closing]

    Jun 20 02:29:50.296: Se0/0/0 PPP: Phase is TERMINATING

    Jun 20 02:29:50.296: Se0/0/0 Deleted neighbor route from AVL tree: topoid 0, address

    10.1.1.1

    Jun 20 02:29:50.296: Se0/0/0 IPCP: Remove route to 10.1.1.1

    Jun 20 02:29:50.296: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.1.1 on Serial0/0/0 from

    FULL to DOWN, Neighbor Down: Interface down or detached



    Jun 20 02:29:50.296: Se0/0/0 LCP: Event[DOWN] State[Closing to Initial]

    Jun 20 02:29:50.296: Se0/0/0 PPP: Phase is DOWN

    Jun 20 02:29:52.296: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,

    changed state to down



    .Jun 20 02:29:52.296: Se0/0/0 PPP: Sending cstate UP notification

    .Jun 20 02:29:52.296: Se0/0/0 PPP: Processing CstateUp message

    .Jun 20 02:29:52.296: PPP: Alloc Context [29F9F32C]

    .Jun 20 02:29:52.296: ppp3 PPP: Phase is ESTABLISHING

    .Jun 20 02:29:52.296: Se0/0/0 PPP: Using default call direction

    .Jun 20 02:29:52.296: Se0/0/0 PPP: Treating connection as a dedicated line

    .Jun 20 02:29:52.296: Se0/0/0 PPP: Session handle[60000003] Session id[3]

    .Jun 20 02:29:52.296: Se0/0/0 LCP: Event[OPEN] State[Initial to Starting]

    .Jun 20 02:29:52.296: Se0/0/0 LCP: O CONFREQ [Starting] id 1 len 10

    .Jun 20 02:29:52.296: Se0/0/0 LCP: MagicNumber 0x7397843B (0x05067397843B)

    .Jun 20 02:29:52.296: Se0/0/0 LCP:Event[UP] State[Starting to REQsent]

    .Jun 20 02:29:54.308: Se0/0/0 LCP: O CONFREQ [REQsent] id 2 len 10

    .Jun 20 02:29:54.308: Se0/0/0 LCP: MagicNumber 0x7397843B (0x05067397843B)

    .Jun 20 02:29:54.308: Se0/0/0 LCP: Event[Timeout+] State[REQsent to REQsent]

    .Jun 20 02:29:56.080: Se0/0/0 PPP: I pkt type 0x008F, datagramsize 24 link[illegal]

    .Jun 20 02:29:56.080: Se0/0/0 UNKNOWN(0x008F): Non-NCP packet, discarding

    <Данные опущены>

    .Jun 20 02:30:10.436: Se0/0/0 LCP: O CONFREQ [REQsent] id 10 len 10

    .Jun 20 02:30:10.436: Se0/0/0 LCP: MagicNumber 0x7397843B (0x05067397843B)

    .Jun 20 02:30:10.436: Se0/0/0 LCP: Event[Timeout+] State[REQsent to REQsent]

    .Jun 20 02:30:12.452: Se0/0/0 PPP DISC: LCP failed to negotiate .Jun 20 02:30:12.452: PPP: NET STOP send to AAA.

    .Jun 20 02:30:12.452: Se0/0/0 LCP: Event[Timeout-] State[REQsent to Stopped]

    .Jun 20 02:30:12.452: Se0/0/0 LCP: Event[DOWN] State[Stopped to Starting]

    .Jun 20 02:30:12.452: Se0/0/0 PPP: Phase is DOWN

    .Jun 20 02:30:14.452: PPP: Alloc Context [29F9F32C]

    .Jun 20 02:30:14.452: ppp4 PPP: Phase is ESTABLISHING

    .Jun 20 02:30:14.452: Se0/0/0 PPP: Using default call direction

    .Jun 20 02:30:14.452: Se0/0/0 PPP: Treating connection as a dedicated line

    .Jun 20 02:30:14.452: Se0/0/0 PPP: Session handle[6E000004] Session id[4]

    .Jun 20 02:30:14.452: Se0/0/0 LCP: Event[OPEN] State[Initial to Starting]

    .Jun 20 02:30:14.452: Se0/0/0 LCP: O CONFREQ [Starting] id 1 len 10

    .Jun 20 02:30:14.452: Se0/0/0 LCP: MagicNumber 0x7397DADA (0x05067397DADA)

    .Jun 20 02:30:14.452: Se0/0/0 LCP: Event[UP] State[Starting to REQsent]

    .Jun 20 02:30:16.080: Se0/0/0 PPP: I pkt type 0x008F, datagramsize 24 link[illegal]

    .Jun 20 02:30:16.080: Se0/0/0 UNKNOWN(0x008F): Non-NCP packet, discarding

    <Данные опущены>

    .Jun 20 02:30:32.580: Se0/0/0 LCP: O CONFREQ [REQsent] id 10 len 10

    .Jun 20 02:30:32.580: Se0/0/0 LCP: MagicNumber 0x7397DADA (0x05067397DADA)

    .Jun 20 02:30:32.580: Se0/0/0 LCP: Event[Timeout+] State[REQsent to REQsent]

    .Jun 20 02:30:34.596: Se0/0/0 PPP DISC: LCP failed to negotiate .Jun 20 02:30:34.596: PPP: NET STOP send to AAA.

    .Jun 20 02:30:34.596: Se0/0/0 LCP: Event[Timeout-] State[REQsent to Stopped]

    .Jun 20 02:30:34.596: Se0/0/0 LCP: Event[DOWN] State[Stopped to Starting]

    .Jun 20 02:30:34.596: Se0/0/0 PPP: Phase is DOWN

    .Jun 20 02:30:36.080: Se0/0/0 PPP: I pkt type 0x008F, discarded, PPP not running

    .Jun 20 02:30:36.596: PPP: Alloc Context [29F9F32C]

    .Jun 20 02:30:36.596: ppp5 PPP: Phase is ESTABLISHING

    .Jun 20 02:30:36.596: Se0/0/0 PPP: Using default call direction

    .Jun 20 02:30:36.596: Se0/0/0 PPP: Treating connection as a dedicated line

    .Jun 20 02:30:36.596: Se0/0/0 PPP: Session handle[34000005] Session id[5]

    .Jun 20 02:30:36.596: Se0/0/0 LCP: Event[OPEN] State[Initial to Starting]

    Что происходит в случае, если на одном конце последовательного канала используется инкапсуляция PPP, а на другом — HDLC?

    _____________________________________________________________________________

    1. Введите команду encapsulation ppp на интерфейсе S0/0/0 маршрутизатора «Филиал 1», чтобы исправить несоответствующую инкапсуляцию.

    Branch1(config)# interface s0/0/0

    Branch1(config-if)# encapsulation ppp

    1. Наблюдайте за сообщениями команды debug PPP от маршрутизатора «Филиал 1» при установке подключения между маршрутизаторами «Филиал 1» и «Главный».

    Branch1(config-if)#

    Jun 20 03:01:57.399: %OSPF-5-ADJCHG: Process 1, Nbr 209.165.200.225 on Serial0/0/0

    from FULL to DOWN, Neighbor Down: Interface down or detached



    Jun 20 03:01:59.399: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,




    changed state to down






    Jun 20 03:01:59.399: Se0/0/0 PPP: Sending cstate UP notification

    Jun 20 03:01:59.399: Se0/0/0 PPP: Processing CstateUp message

    Jun 20 03:01:59.399: PPP: Alloc Context [30F8D4F0]

    Jun 20 03:01:59.399: ppp9 PPP: Phase is ESTABLISHING

    Jun 20 03:01:59.399: Se0/0/0 PPP: Using default call direction

    Jun 20 03:01:59.399: Se0/0/0 PPP: Treating connection as a dedicated line

    Jun 20 03:01:59.399: Se0/0/0 PPP: Session handle[BA000009] Session id[9]

    Jun 20 03:01:59.399: Se0/0/0 LCP: Event[OPEN] State[Initial to Starting]

    Jun 20 03:01:59.399: Se0/0/0 LCP: O CONFREQ [Starting] id 1 len 10

    Jun 20 03:01:59.399: Se0/0/0 LCP: MagicNumber 0x8D0EAC44 (0x05068D0EAC44)

    Jun 20 03:01:59.399: Se0/0/0 LCP: Event[UP] State[Starting to REQsent]

    Jun 20 03:01:59.407: Se0/0/0 PPP: I pkt type 0xC021, datagramsize 14 link[ppp]

    Jun 20 03:01:59.407: Se0/0/0 LCP: I CONFREQ [REQsent] id 1 len 10

    Jun 20 03:01:59.407: Se0/0/0 LCP: MagicNumber 0x73B4F1AF (0x050673B4F1AF)

    Jun 20 03:01:59.407: Se0/0/0 LCP: O CONFACK [REQsent] id 1 len 10

    Jun 20 03:01:59.407: Se0/0/0 LCP: MagicNumber 0x73B4F1AF (0x050673B4F1AF)

    Jun 20 03:01:59.407: Se0/0/0 LCP: Event[Receive ConfReq+] State[REQsent to ACKsent]

    Jun 20 03:01:59.407: Se0/0/0 PPP: I pkt type 0xC021, datagramsize 14 link[ppp]

    Jun 20 03:01:59.407: Se0/0/0 LCP: I CONFACK [ACKsent] id 1 len 10

    Jun 20 03:01:59.407: Se0/0/0 LCP: MagicNumber 0x8D0EAC44 (0x05068D0EAC44)

    Jun 20 03:01:59.407: Se0/0/0 LCP: Event[Receive ConfAck] State[ACKsent to Open]

    Jun 20 03:01:59.439: Se0/0/0 PPP: Phase is FORWARDING, Attempting Forward

    Jun 20 03:01:59.439: Se0/0/0 LCP: State is Open

    Jun 20 03:01:59.439: Se0/0/0 PPP: Phase is ESTABLISHING, Finish LCP

    Jun 20 03:01:59.439: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,

    changed state to up



    Jun 20 03:01:59.439: Se0/0/0 PPP: Outbound cdp packet dropped, line protocol not up

    Jun 20 03:01:59.439: Se0/0/0 PPP: Phase is UP

    Jun 20 03:01:59.439: Se0/0/0 IPCP: Protocol configured, start CP. state[Initial]

    Jun 20 03:01:59.439: Se0/0/0 IPCP: Event[OPEN] State[Initial to Starting]

    Jun 20 03:01:59.439: Se0/0/0 IPCP: O CONFREQ [Starting] id 1 len 10

    Jun 20 03:01:59.439: Se0/0/0 IPCP: Address 10.1.1.1 (0x03060A010101)

    Jun 20 03:01:59.439: Se0/0/0 IPCP: Event[UP] State[Starting to REQsent]

    Jun 20 03:01:59.439: Se0/0/0 CDPCP: Protocol configured, start CP. state[Initial]

    <Данные опущены>

    Jun 20 03:01:59.471: Se0/0/0 Added to neighbor route AVL tree: topoid 0, address

    10.1.1.2

    Jun 20 03:01:59.471: Se0/0/0 IPCP: Install route to 10.1.1.2

    Jun 20 03:01:59.471: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 80

    Jun 20 03:01:59.479: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 80 link[ip]

    Jun 20 03:01:59.479: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 84

    Jun 20 03:01:59.483: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 84 link[ip]

    Jun 20 03:01:59.483: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 68

    Jun 20 03:01:59.491: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 68 link[ip]

    Jun 20 03:01:59.491: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 148

    Jun 20 03:01:59.511: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 148 link[ip]

    Jun 20 03:01:59.511: %OSPF-5-ADJCHG:Process 1, Nbr 209.165.200.225 on Serial0/0/0 from

    LOADING to FULL, Loading Done



    Jun 20 03:01:59.511: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 68

    Jun 20 03:01:59.519: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 60 link[ip]

    h. Наблюдайте за сообщениями команды debug PPP от маршрутизатора «Главный» при установке подключения между маршрутизаторами «Филиал 1» и «Главный».

    Jun 20 03:01:59.393: Se0/0/0 PPP: I pkt type 0xC021, datagramsize 14 link[ppp]

    Jun 20 03:01:59.393: Se0/0/0 LCP: I CONFREQ [Open] id 1 len 10

    Jun 20 03:01:59.393: Se0/0/0 LCP: MagicNumber 0x8D0EAC44 (0x05068D0EAC44)

    Jun 20 03:01:59.393: Se0/0/0 PPP DISC: PPP Renegotiating Jun 20 03:01:59.393: PPP: NET STOP send to AAA.

    Jun 20 03:01:59.393: Se0/0/0 LCP: Event[LCP Reneg] State[Open to Open]

    Jun 20 03:01:59.393: Se0/0/0 IPCP: Event[DOWN] State[Open to Starting]

    Jun 20 03:01:59.393: Se0/0/0 IPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 03:01:59.393: Se0/0/0 CDPCP: Event[DOWN] State[Open to Starting]

    Jun 20 03:01:59.393: Se0/0/0 CDPCP: Event[CLOSE] State[Starting to Initial]

    Jun 20 03:01:59.393: Se0/0/0 LCP: Event[DOWN] State[Open to Starting]

    Jun 20 03:01:59.393: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,

    changed state to down



    Jun 20 03:01:59.393: Se0/0/0 PPP: Outbound cdp packet dropped, NCP not negotiated

    .Jun 20 03:01:59.393: Se0/0/0 PPP: Phase is DOWN

    .Jun 20 03:01:59.393: Se0/0/0 Deleted neighbor route from AVL tree: topoid 0, address

    10.1.1.1

    .Jun 20 03:01:59.393: Se0/0/0 IPCP: Remove route to 10.1.1.1

    .Jun 20 03:01:59.393: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.1.1 on Serial0/0/0 from

    FULL to DOWN, Neighbor Down: Interface down or detached



    .Jun 20 03:01:59.397: PPP: Alloc Context [29F9F32C]

    .Jun 20 03:01:59.397: ppp38 PPP: Phase is ESTABLISHING

    .Jun 20 03:01:59.397: Se0/0/0 PPP: Using default call direction

    .Jun 20 03:01:59.397: Se0/0/0 PPP: Treating connection as a dedicated line

    <Данные опущены>

    .Jun 20 03:01:59.401: Se0/0/0 LCP: MagicNumber 0x73B4F1AF (0x050673B4F1AF)

    .Jun 20 03:01:59.401: Se0/0/0 LCP: Event[Receive ConfAck] State[ACKsent to Open]

    .Jun 20 03:01:59.433: Se0/0/0 PPP: Phase is FORWARDING, Attempting Forward

    .Jun 20 03:01:59.433: Se0/0/0 LCP: State is Open

    .Jun 20 03:01:59.433: Se0/0/0 PPP: I pkt type 0x8021, datagramsize 14 link[ip]

    .Jun 20 03:01:59.433: Se0/0/0 PPP: Queue IPCP code[1] id[1]

    .Jun 20 03:01:59.433: Se0/0/0 PPP: I pkt type 0x8207, datagramsize 8 link[cdp]

    .Jun 20 03:01:59.433: Se0/0/0 PPP: Discarded CDPCP code[1] id[1]

    .Jun 20 03:01:59.433: Se0/0/0 PPP: Phase is ESTABLISHING, Finish LCP

    .Jun 20 03:01:59.433: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0,

    changed state to up



    .Jun 20 03:01:59.433: Se0/0/0 PPP: Outbound cdp packet dropped, line protocol not up

    .Jun 20 03:01:59.433: Se0/0/0 PPP: Phase is UP

    .Jun 20 03:01:59.433: Se0/0/0 IPCP: Protocol configured, start CP. state[Initial]

    .Jun 20 03:01:59.433: Se0/0/0 IPCP: Event[OPEN] State[Initial to Starting]

    .Jun 20 03:01:59.433: Se0/0/0 IPCP: O CONFREQ [Starting] id 1 len 10

    .Jun 20 03:01:59.433: Se0/0/0 IPCP: Address 10.1.1.2 (0x03060A010102)

    .Jun 20 03:01:59.433: Se0/0/0 IPCP: Event[UP] State[Starting to REQsent]

    .Jun 20 03:01:59.433: Se0/0/0 CDPCP: Protocol configured, start CP. state[Initial]

    .Jun 20 03:01:59.433: Se0/0/0 CDPCP: Event[OPEN] State[Initial to Starting]

    .Jun 20 03:01:59.433: Se0/0/0 CDPCP: O CONFREQ [Starting] id 1 len 4

    .Jun 20 03:01:59.433: Se0/0/0 CDPCP: Event[UP] State[Starting to REQsent]

    <Данные опущены>

    .Jun 20 03:01:59.465: Se0/0/0 IPCP: State is Open

    .Jun 20 03:01:59.465: Se0/0/0 Added to neighbor route AVL tree: topoid 0, address

    10.1.1.1

    .Jun 20 03:01:59.465: Se0/0/0 IPCP: Install route to 10.1.1.1

    .Jun 20 03:01:59.465: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 80

    .Jun 20 03:01:59.465: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 80 link[ip]

    .Jun 20 03:01:59.469: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 84

    .Jun 20 03:01:59.477: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 84 link[ip]

    .Jun 20 03:01:59.477: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 68

    .Jun 20 03:01:59.481: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 68 link[ip]

    .Jun 20 03:01:59.489: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 148 link[ip]

    .Jun 20 03:01:59.493: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 148

    .Jun 20 03:01:59.505: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 68 link[ip]

    .Jun 20 03:01:59.505: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 60

    .Jun 20 03:01:59.517: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 88 link[ip]

    .Jun 20 03:01:59.517: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.1.1 on Serial0/0/0 from

    LOADING to FULL, Loading Done



    .Jun 20 03:01:59.561: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 80

    .Jun 20 03:01:59.569: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 80 link[ip]

    Jun 20 03:02:01.445: Se0/0/0 PPP: I pkt type 0x8207, datagramsize 8 link[cdp]

    Jun 20 03:02:01.445: Se0/0/0 CDPCP: I CONFREQ [ACKrcvd] id 2 len 4

    Jun 20 03:02:01.445: Se0/0/0 CDPCP: O CONFACK [ACKrcvd] id 2 len 4

    Jun 20 03:02:01.445: Se0/0/0 CDPCP: Event[Receive ConfReq+] State[ACKrcvd to Open]

    Jun 20 03:02:01.449: Se0/0/0 CDPCP: State is Open

    Jun 20 03:02:01.561: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 80

    Jun 20 03:02:01.569: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 80 link[ip]

    Jun 20 03:02:02.017: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 68

    Jun 20 03:02:02.897: Se0/0/0 PPP: I pkt type 0x0021, datagramsize 112 link[ip]

    Jun 20 03:02:03.561: Se0/0/0 PPP: O pkt type 0x0021, datagramsize 80

    Основываясь на сообщении команды debug, укажите, через какие этапы проходит PPP, если другой конец последовательного канала на маршрутизаторе Central настроен с инкапсуляцией PPP.

    _____________________________________________________________________________

    Что произойдет, если инкапсуляция PPP настроена на обоих концах последовательного канала?

    _____________________________________________________________________________

    1. Введите команду undebug all (или u all) на маршрутизаторах «Филиал 1» и «Главный» и отключите всю отладку на обоих маршрутизаторах.

    2. После стабилизации сети выполните команду show ip interface brief на маршрутизаторах «Филиал 1» и «Главный». Укажите состояние интерфейса S0/0/0 на обоих маршрутизаторах.

    _____________________________________________________________________________

    1. Убедитесь, что интерфейс S0/0/0 как на маршрутизаторе «Филиал 1», так и на маршрутизаторе «Главный» настроен на инкапсуляцию PPP.

    Ниже запишите команду для проверки инкапсуляции PPP.

    _____________________________________________________________________________

    1. Инкапсуляцию в последовательном интерфейсе для связи между маршрутизаторами «Главный» и «Филиал 3» измените на инкапсуляцию PPP.

    Central(config)# interface s0/0/1

    Central(config-if)# encapsulation ppp

    Central(config-if)#

    Jun 20 03:17:15.933: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.3.1 on Serial0/0/1 from

    FULL to DOWN, Neighbor Down: Interface down or detached



    Jun 20 03:17:17.933: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1,




    changed state to down






    Jun 20 03:17:23.741: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1,




    changed state to up






    Jun 20 03:17:23.825: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.3.1 on Serial0/0/1 from

    LOADING to FULL, Loading Done





    Branch3(config)# interface s0/0/1

    Branch3(config-if)# encapsulation ppp

    Branch3(config-if)#

    Jun 20 03:17:21.744: %OSPF-5-ADJCHG: Process 1, Nbr 209.165.200.225 on Serial0/0/1




    from FULL to DOWN, Neighbor Down: Interface down or detached






    Jun 20 03:17:21.948: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1,







    changed state to down









    .Jun 20 03:17:21.964: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1,




    changed state to up






    .Jun 20 03:17:23.812: %OSPF-5-ADJCHG: Process 1, Nbr 209.165.200.225 on Serial0/0/1

    from LOADING to FULL, Loading Done



    1. Перед переходом к части 3 убедитесь в том, что сквозное соединение восстановлено.
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