Configurazione del backup ISDN con route statiche mobili

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Aggiornato:4 febbraio 2010
ID documento:12497

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Introduzione

In questo documento viene fornito un esempio di configurazione per l'implementazione di un backup ISDN con route statiche mobili e vengono fornite informazioni di base per la risoluzione dei problemi di questo tipo di configurazione.

Per informazioni sulle implementazioni più comuni di backup ISDN e sui relativi confronti, consultare il documento seguente: Valutazione di interfacce di backup, route statiche mobili e Dialer Watch per il backup DDR.

Prerequisiti

Requisiti

Nessun requisito specifico previsto per questo documento.

Componenti usati

Le informazioni fornite in questo documento si basano sulle versioni software e hardware riportate di seguito.

  • Due router Cisco 2500 con software Cisco IOS® versione 12.2(3) e 12.2(5)

Le informazioni discusse in questo documento fanno riferimento a dispositivi usati in uno specifico ambiente di emulazione. Su tutti i dispositivi menzionati nel documento la configurazione è stata ripristinata ai valori predefiniti. Se la rete è operativa, valutare attentamente eventuali conseguenze derivanti dall'uso dei comandi.

Convenzioni

Per ulteriori informazioni sulle convenzioni usate, consultare il documento Cisco sulle convenzioni nei suggerimenti tecnici.

Configurazione

In questa sezione vengono presentate le informazioni necessarie per configurare le funzionalità descritte più avanti nel documento.

Nota: per ulteriori informazioni sui comandi menzionati in questo documento, usare lo strumento di ricerca dei comandi (solo utenti registrati).

Esempio di rete

Questo documento utilizza le impostazioni di rete mostrate nel diagramma sottostante.

diagram.gif

Configurazioni

Questo documento utilizza le configurazioni mostrate di seguito.

krimson (Cisco 2500 Router) 
krimson#show running-config
 Building configuration...

 !
 version 12.2
 service timestamps debug datetime msec
 service timestamps log datetime msec
 !
 hostname krimson
 !
 username kevin password 0 <password>
 !
 isdn switch-type basic-net3
 !
 !
 interface Loopback0
 ip address 10.7.7.1 255.255.255.0
 !
 interface Serial0
 ip address 10.1.2.1 255.255.255.0
 !
 interface BRI0
 no ip address
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 load-interval 30
 dialer pool-member 1
 isdn switch-type basic-net3
 no fair-queue
 no cdp enable
 ppp authentication chap
 !
 interface Dialer0
 ip address 10.9.9.1 255.255.255.0
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 dialer pool 1
 dialer remote-name kevin


 dialer string 8114
 dialer-group 1
 no cdp enable
 ppp authentication chap
 !
 ip classless
 ip route 10.8.8.0 255.255.255.0 10.1.2.2
 ip route 10.8.8.0 255.255.255.0 10.9.9.2 180
 no ip http server
 !
 dialer-list 1 protocol ip permit
 !
 !
 line con 0
 exec-timeout 0 0
 line aux 0
 line vty 0 4
 exec-timeout 0 0
 password <password> login
 !
 end

Kevin (Cisco 2500 Router) 
kevin#show running-config
 Building configuration...

 Current configuration : 1205 bytes
 !
 version 12.2
 service timestamps debug datetime msec
 service timestamps log datetime msec
 no service password-encryption
 !
 hostname kevin
 !
 username krimson password 0 <password>
 !
 isdn switch-type basic-net3
 !
 !
 !
 interface Loopback0
 ip address 10.8.8.1 255.255.255.0
 !
 interface Serial0
 ip address 10.1.2.2 255.255.255.0
 clockrate 2000000
 !
 interface Serial1
 no ip address
 shutdown
 !
 interface BRI0
 no ip address
 encapsulation ppp
 dialer pool-member 1
 isdn switch-type basic-net3
 no cdp enable
 ppp authentication chap
 !
 interface Dialer0
 ip address 10.9.9.2 255.255.255.0
 encapsulation ppp
 dialer pool 1
 dialer remote-name krimson
 dialer string 8113
 dialer-group 1
 no cdp enable
 ppp authentication chap
 !
 !
 dialer-list 1 protocol ip permit
 !
 !
 line con 0
 exec-timeout 0 0
 line aux 0
 line vty 0 4
 exec-timeout 0 0
 password <password> login
 !
 end

Verifica

Le informazioni contenute in questa sezione permettono di verificare che la configurazione funzioni correttamente.

Alcuni comandi show sono supportati dallo strumento Output Interpreter (solo utenti registrati); lo strumento permette di visualizzare un'analisi dell'output del comando show.

  • show ip route: visualizza le voci della tabella di routing IP.

  • show interfaces: visualizza le statistiche per tutte le interfacce configurate sul router o sul server di accesso.

Risoluzione dei problemi

Le informazioni contenute in questa sezione permettono di risolvere i problemi relativi alla configurazione.

Comandi per la risoluzione dei problemi

Alcuni comandi show sono supportati dallo strumento Output Interpreter (solo utenti registrati); lo strumento permette di visualizzare un'analisi dell'output del comando show.

Nota: prima di usare i comandi di debug, consultare le informazioni importanti sui comandi di debug.

  • debug isdn q931 - Visualizza informazioni sulla configurazione delle chiamate e sul disinserimento delle connessioni di rete ISDN (livello 3) tra il router locale (lato utente) e la rete.

  • debug isdn events: visualizza gli eventi ISDN che si verificano sul lato utente (sul router) dell'interfaccia ISDN. È possibile visualizzare gli eventi ISDN Q.931 (configurazione delle chiamate e disinstallazione delle connessioni di rete ISDN).

  • debug dialer: visualizza le informazioni di debug sui pacchetti o gli eventi su un'interfaccia dialer.

  • debug ppp negotiation - Fa in modo che il comando debug ppp visualizzi i pacchetti PPP trasmessi durante l'avvio del protocollo PPP, in cui le opzioni PPP vengono negoziate.

  • debug ppp authentication: causa la visualizzazione da parte del comando debug ppp dei messaggi del protocollo di autenticazione, inclusi gli scambi di pacchetti Challenge Authentication Protocol (CHAP) e gli scambi di pacchetti Password Authentication Protocol (PAP).

Output di esempio della risoluzione dei problemi

In questo caso, è possibile testare la funzionalità di backup utilizzando i comandi shutdown e no shutdown sull'interfaccia seriale del lato remoto. Ciò porta, di comune accordo, alla scomparsa della rotta IP principale verso la rete di destinazione in questione.

Esaminiamo prima lo stato iniziale dell'interfaccia primaria e la tabella di routing IP:

Lato chiamata: 

   krimson#show interface serial 0
   Serial0 is up, line protocol is up 
   Hardware is HD64570
   Internet address is 10.1.2.1/24
   MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation HDLC, loopback not set
   Keepalive set (10 sec)
   Last input 00:00:07, output 00:00:07, 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: weighted fair
   Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
   Conversations 0/1/256 (active/max active/max total)
   Reserved Conversations 0/0 (allocated/max allocated)
   Available Bandwidth 1158 kilobits/sec
   5 minute input rate 1000 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
   92 packets input, 7599 bytes, 0 no buffer
   Received 62 broadcasts, 0 runts, 0 giants, 0 throttles
   0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
   99 packets output, 8991 bytes, 0 underruns
   0 output errors, 0 collisions, 12 interface resets
   0 output buffer failures, 0 output buffers swapped out
   4 carrier transitions
   DCD=up DSR=up DTR=up RTS=up CTS=up
   
   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
   C 10.1.2.0/24 is directly connected, Serial0
   S 10.8.8.0/24 [1/0] via 10.1.2.2 
  
 !--- The IP route for the destination network points to the primary link.

   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1

Lato chiamato: 

   kevin#show interface serial 0
   Serial0 is up, line protocol is up 
   Hardware is HD64570
   Internet address is 10.1.2.2/24
   MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation HDLC, loopback not set
   Keepalive set (10 sec)
   Last input 00:00:00, output 00:00:08, 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: weighted fair
   Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
   Conversations 0/1/256 (active/max 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
   106 packets input, 9432 bytes, 0 no buffer
   Received 71 broadcasts, 0 runts, 0 giants, 0 throttles
   0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
   98 packets output, 8016 bytes, 0 underruns
   0 output errors, 0 collisions, 4 interface resets
   0 output buffer failures, 0 output buffers swapped out
   1 carrier transitions
   DCD=up DSR=up DTR=up RTS=up CTS=up
  
   kevin#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
   C 10.1.2.0/24 is directly connected, Serial0
   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.8.8.0/24 is directly connected, Loopback0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1
   kevin#

A questo punto è possibile simulare il problema del collegamento utilizzando il comando shutdown sull'interfaccia seriale remota: 

   krimson#
   *Mar 4 15:25:18.302: %LINK-3-UPDOWN: Interface Serial0, changed state to
   down
   *Mar 4 15:25:19.302: %LINEPROTO-5-UPDOWN: Line protocol on Interface
   Serial0, changed state to down

Qui possiamo vedere che il collegamento primario è andato in tilt.

   krimson#show interface serial 0
   Serial0 is down, line protocol is down 
   Hardware is HD64570
   Internet address is 10.1.2.1/24
   MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation HDLC, loopback not set
   Keepalive set (10 sec)
   Last input 00:00:22, output 00:00:32, 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: weighted fair
   Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
   Conversations 0/1/256 (active/max 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
   108 packets input, 8526 bytes, 0 no buffer
   Received 78 broadcasts, 0 runts, 0 giants, 0 throttles
   0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
   114 packets output, 9895 bytes, 0 underruns
   0 output errors, 0 collisions, 12 interface resets
   0 output buffer failures, 0 output buffers swapped out
   5 carrier transitions
   DCD=down DSR=down DTR=up RTS=up CTS=down
   krimson#

I dettagli della tabella di routing mostrano ora che la route statica mobile è installata nella tabella di routing: 

   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
   S 10.8.8.0/24 [180/0] via 10.9.9.2
   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1
   krimson#

Sul router chiamato, è possibile simulare l'errore del collegamento primario simulato usando il comando shutdown sull'interfaccia 0 seriale locale: 

   kevin#configure terminal
   Enter configuration commands, one per line. End with CNTL/Z.
   kevin(config)#interface serial 0
   kevin(config-if)#shutdown

   *Mar 4 15:32:00.250: %LINK-5-CHANGED: Interface Serial0, changed state to
   administratively down
   *Mar 4 15:32:01.250: %LINEPROTO-5-UPDOWN: Line protocol on Interface
   Serial0, changed state to down
   *Mar 4 15:32:03.742: %SYS-5-CONFIG_I: Configured from console by console

Ora possiamo vedere che il collegamento principale si interrompe: 

   kevin#show interface serial 0
   Serial0 is administratively down, line protocol is down 
   Hardware is HD64570
   Internet address is 10.1.2.2/24
   MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation HDLC, loopback not set
   Keepalive set (10 sec)
   Last input 00:01:28, output 00:01:18, 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: weighted fair
   Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
   Conversations 0/1/256 (active/max 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
   114 packets input, 9895 bytes, 0 no buffer
   Received 79 broadcasts, 0 runts, 0 giants, 0 throttles
   0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
   108 packets output, 8526 bytes, 0 underruns
   0 output errors, 0 collisions, 4 interface resets
   0 output buffer failures, 0 output buffers swapped out
   1 carrier transitions
   DCD=down DSR=down DTR=up RTS=up CTS=down

Il traffico ping, definito come traffico interessante, avvia la chiamata in uscita tramite l'interfaccia di connessione 0 per il backup. 

   krimson#ping 10.8.8.1

   Type escape sequence to abort.
   Sending 5, 100-byte ICMP Echos to 10.8.8.1, timeout is 2 seconds:

   *Mar 4 15:27:39.618: BR0 DDR: rotor dialout [priority]
   *Mar 4 15:27:39.622: BR0 DDR: Dialing cause ip (s=10.9.9.1, d=10.8.8.1)
   *Mar 4 15:27:39.626: BR0 DDR: Attempting to dial 8114
   *Mar 4 15:27:39.642: ISDN BR0: TX -> SETUP pd = 8 callref = 0x09
   *Mar 4 15:27:39.646: Bearer Capability i = 0x8890
   *Mar 4 15:27:39.654: Channel ID i = 0x83
   *Mar 4 15:27:39.658: Called Party Number i = 0x80, '8114',
   Plan:Unknown, Type:Unknown
   *Mar 4 15:27:39.718: ISDN BR0: RX <- CALL_PROC pd = 8 callref = 0x89
   *Mar 4 15:27:39.722: Channel ID i = 0x89
   *Mar 4 15:27:39.974: ISDN BR0: RX <- CONNECT pd = 8 callref = 0x89
   *Mar 4 15:27:39.990: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
   *Mar 4 15:27:39.998: %DIALER-6-BIND: Interface BR0:1 bound to profile Di0
   *Mar 4 15:27:40.010: BR0:1 PPP: Treating connection as a callout
   *Mar 4 15:27:40.010: BR0:1 PPP: Phase is ESTABLISHING, Active Open [0 sess, 0 load]
   *Mar 4 15:27:40.014: BR0:1 LCP: O .!!!CONFREQ [Closed] id 19 len 15
   *Mar 4 15:27:40.018: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:27:40.022: BR0:1 LCP: MagicNumber 0x12D0A490 (0x050612D0A490)
   *Mar 4 15:27:40.030: ISDN BR0: TX -> CONNECT_ACK pd = 8 callref = 0x09
   *Mar 4 15:27:40.054: BR0:1 LCP: I CONFREQ [REQsent] id 9 len 15
   *Mar 4 15:27:40.058: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:27:40.062: BR0:1 LCP: MagicNumber 0x12D6B638 (0x050612D6B638)
   *Mar 4 15:27:40.066: BR0:1 LCP: O CONFACK [REQsent] id 9 len 15
   *Mar 4 15:27:40.066: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:27:40.070: BR0:1 LCP: MagicNumber 0x12D6B638 (0x050612D6B638)
   *Mar 4 15:27:40.074: BR0:1 LCP: I CONFACK [ACKsent] id 19 len 15
   *Mar 4 15:27:40.078: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:27:40.082: BR0:1 LCP: MagicNumber 0x12D0A490 (0x050612D0A490)
   *Mar 4 15:27:40.082: BR0:1 LCP: State is Open
   *Mar 4 15:27:40.086: BR0:1 PPP: Phase is AUTHENTICATING, by both [0 sess, 0 load]
   *Mar 4 !
   Suc15:27:40.090: BR0:1 CHAP: O CHALLENGE id 7 len 28 from "krimson"
   *Mar 4 15:27:40.106: BR0:1 CHAP: I CHALLENGE id 7 len 26 from "kevin"
   *Mar 4 15:27:40.110: BR0:1 CHAP: O RESPONSE id 7 len 28 from "krimson"
   *Mar 4 15:27:40.138: BR0:1 CHAP: I SUCCESS id 7 len 4
   *Mar 4 15:27:40.150: BR0:1 CHAP: I RESPONSE id 7 len 26 from "kevin"
   *Mar 4 15:27:40.158: BR0:1 CHAP: O SUCCESS id 7 len 4
   *Mar 4 15:27:40.162: BR0:1 PPP: Phase is UP [0 sess, 0 load]
   *Mar 4 15:27:40.166: BR0:1 IPCP: O CONFREQ [Not negotiated] id 2 len 10
   *Mar 4 15:27:40.170: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Mar 4 15:27:40.186: BR0:1 IPCP: I CONFREQ [REQsent] id 2 len 10
   *Mar 4 15:27:40.190: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Mar 4 15:27:40.190: BR0:1 IPCP: O CONFACK [REQsent] id 2 len 10
   *Mar 4 15:27:40.194: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Mar 4 15:27:40.202: BR0:1 IPCP: I CONFACK [ACKsent] id 2 len 10
   *Mar 4 15:27:40.206: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Mar 4 15:27:40.206: BR0:1 IPCP: State is Open
   *Mar 4 15:27:40.214: BR0:1 DDR: dialer protocol up
   *Mar 4 15:27:40.218: Di0 IPCP: Install route to 10.9.9.2
   *Mar 4 15:27:41.162: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1,
   changed state to upcess rate is 80 percent (4/5), round-trip min/avg/max =
   36/47/76 ms
   krimson#

Allo stesso tempo, i debug in esecuzione sul lato chiamato mostrano il seguente output per la stessa chiamata: 

   kevin#   
   *Mar 4 15:34:21.698: ISDN BR0: RX <- SETUP pd = 8 callref = 0x07
   *Mar 4 15:34:21.706: Bearer Capability i = 0x8890
   *Mar 4 15:34:21.714: Channel ID i = 0x89
   *Mar 4 15:34:21.718: Calling Party Number i = 0xA1, '8113',
   Plan:ISDN, Type:National
   *Mar 4 15:34:21.734: Called Party Number i = 0xC1, '8114',
   Plan:ISDN, Type:Subscriber(local)
   *Mar 4 15:34:21.762: ISDN BR0: Event: Received a DATA call from 8113 on B1
   at 64 Kb/s
   *Mar 4 15:34:21.762: ISDN BR0: Event: Accepting the call id 0xC
   *Mar 4 15:34:21.766: BR0:1: interface must be fifo queue, force fifo
   *Mar 4 15:34:21.774: %DIALER-6-BIND: Interface BR0:1 bound to profile Di0
   *Mar 4 15:34:21.786: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
   *Mar 4 15:34:21.798: BR0:1 PPP: Treating connection as a callin
   *Mar 4 15:34:21.802: BR0:1 PPP: Phase is ESTABLISHING, Passive Open [0 sess,
   0 load]
   *Mar 4 15:34:21.806: BR0:1 LCP: State is Listen
   *Mar 4 15:34:21.818: ISDN BR0: TX -> CALL_PROC pd = 8 callref = 0x87
   *Mar 4 15:34:21.826: Channel ID i = 0x89
   *Mar 4 15:34:21.854: ISDN BR0: TX -> CONNECT pd = 8 callref = 0x87
   *Mar 4 15:34:21.918: ISDN BR0: RX <- CONNECT_ACK pd = 8 callref = 0x07
   *Mar 4 15:34:21.926: Channel ID i = 0x89
   *Mar 4 15:34:21.978: BR0:1 LCP: I CONFREQ [Listen] id 19 len 15
   *Mar 4 15:34:21.982: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:34:21.986: BR0:1 LCP: MagicNumber 0x12D0A490 (0x050612D0A490)
   *Mar 4 15:34:21.990: BR0:1 LCP: O CONFREQ [Listen] id 9 len 15
   *Mar 4 15:34:21.994: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:34:21.994: BR0:1 LCP: MagicNumber 0x12D6B638 (0x050612D6B638)
   *Mar 4 15:34:21.998: BR0:1 LCP: O CONFACK [Listen] id 19 len 15
   *Mar 4 15:34:22.002: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:34:22.006: BR0:1 LCP: MagicNumber 0x12D0A490 (0x050612D0A490)
   *Mar 4 15:34:22.030: BR0:1 LCP: I CONFACK [ACKsent] id 9 len 15
   *Mar 4 15:34:22.034: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Mar 4 15:34:22.034: BR0:1 LCP: MagicNumber 0x12D6B638 (0x050612D6B638)
   *Mar 4 15:34:22.038: BR0:1 LCP: State is Open
   *Mar 4 15:34:22.042: BR0:1 PPP: Phase is AUTHENTICATING, by both [0 sess, 0
   load]
   *Mar 4 15:34:22.046: BR0:1 CHAP: O CHALLENGE id 7 len 26 from "kevin"
   *Mar 4 15:34:22.050: BR0:1 CHAP: I CHALLENGE id 7 len 28 from "krimson"
   *Mar 4 15:34:22.054: BR0:1 CHAP: Waiting for peer to authenticate first
   *Mar 4 15:34:22.070: BR0:1 CHAP: I RESPONSE id 7 len 28 from "krimson"
   *Mar 4 15:34:22.078: BR0:1 CHAP: O SUCCESS id 7 len 4
   *Mar 4 15:34:22.082: BR0:1 CHAP: Processing saved Challenge, id 7
   *Mar 4 15:34:22.090: BR0:1 CHAP: O RESPONSE id 7 len 26 from "kevin"
   *Mar 4 15:34:22.114: BR0:1 CHAP: I SUCCESS id 7 len 4
   *Mar 4 15:34:22.118: BR0:1 PPP: Phase is UP [0 sess, 0 load]
   *Mar 4 15:34:22.122: BR0:1 IPCP: O CONFREQ [Not negotiated] id 2 len 10
   *Mar 4 15:34:22.126: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Mar 4 15:34:22.130: BR0:1 IPCP: I CONFREQ [REQsent] id 2 len 10
   *Mar 4 15:34:22.134: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Mar 4 15:34:22.138: BR0:1 IPCP: O CONFACK [REQsent] id 2 len 10
   *Mar 4 15:34:22.142: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Mar 4 15:34:22.226: BR0:1 IPCP: I CONFACK [ACKsent] id 2 len 10
   *Mar 4 15:34:22.230: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Mar 4 15:34:22.230: BR0:1 IPCP: State is Open
   *Mar 4 15:34:22.242: BR0:1 DDR: dialer protocol up
   *Mar 4 15:34:22.250: Di0 IPCP: Install route to 10.9.9.1
   *Mar 4 15:34:23.114: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1,
   changed state to up
   *Mar 4 15:34:27.794: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to
   8113 krimson

Lo stato dopo il backup è "attivo":

   krimson#show interface dialer 0
   Dialer0 is up, line protocol is up (spoofing)
   Hardware is Unknown
   Internet address is 10.9.9.1/24
   MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   DTR is pulsed for 1 seconds on reset
   Interface is bound to BR0:1
   Last input never, output never, output hang never
   Last clearing of "show interface" counters 00:13:26
   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) 
   Conversations 0/1/16 (active/max active/max total)
   Reserved Conversations 0/0 (allocated/max allocated)
   Available Bandwidth 42 kilobits/sec
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
   36 packets input, 2160 bytes
   36 packets output, 2160 bytes
   Bound to:
   BRI0:1 is up, line protocol is up 
   Hardware is BRI
   MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   Keepalive set (10 sec)
   Time to interface disconnect: idle 00:01:33
   Interface is bound to Di0 (Encapsulation PPP)
   LCP Open
   Open: IPCP
   Last input 00:00:26, output 00:00:01, output hang never
   Last clearing of "show interface" counters never
   Queueing strategy: fifo
   Output queue 0/40, 0 drops; input queue 0/75, 0 drops
   30 second input rate 0 bits/sec, 0 packets/sec
   30 second output rate 0 bits/sec, 0 packets/sec
   126 packets input, 3664 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
   131 packets output, 3777 bytes, 0 underruns
   0 output errors, 0 collisions, 15 interface resets
   0 output buffer failures, 0 output buffers swapped out
   28 carrier transitions

   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
   C 10.9.9.2/32 is directly connected, Dialer0
   S 10.8.8.0/24 [180/0] via 10.9.9.2
   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1

Sul lato chiamato:

Lo stato dopo il backup è "attivo". 

   kevin#show interface dialer 0
   Dialer0 is up, line protocol is up (spoofing)
   Hardware is Unknown
   Internet address is 10.9.9.2/24
   MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   DTR is pulsed for 1 seconds on reset
   Interface is bound to BR0:1
   Last input never, output never, output hang never
   Last clearing of "show interface" counters 00:16:18
   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) 
   Conversations 0/1/16 (active/max active/max total)
   Reserved Conversations 0/0 (allocated/max allocated)
   Available Bandwidth 42 kilobits/sec
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
   40 packets input, 2224 bytes
   40 packets output, 2224 bytes
   Bound to:
   BRI0:1 is up, line protocol is up 
   Hardware is BRI
   MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   Keepalive set (10 sec)
   Time to interface disconnect: idle 00:01:11
   Interface is bound to Di0 (Encapsulation PPP)
   LCP Open
   Open: IPCP
   Last input 00:00:48, output 00:00:00, output hang never
   Last clearing of "show interface" counters never
   Queueing strategy: fifo
   Output queue 0/40, 0 drops; input queue 0/75, 0 drops
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
   136 packets input, 3857 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
   131 packets output, 3744 bytes, 0 underruns
   0 output errors, 0 collisions, 12 interface resets
   0 output buffer failures, 0 output buffers swapped out
   35 carrier transitions

   kevin#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 4 subnets, 3 masks
   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.8.8.0/24 is directly connected, Loopback0
   C 10.9.9.1/32 is directly connected, Dialer0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1

In questo caso, viene simulato il ripristino del collegamento primario utilizzando il comando no shutdown sull'interfaccia seriale remota: 

   krimson# 
   *Mar 4 15:28:58.726: %LINK-3-UPDOWN: Interface Serial0, changed state to up
   *Mar 4 15:28:59.730: %LINEPROTO-5-UPDOWN: Line protocol on Interface
   Serial0, changed state to up

Il backup viene disconnesso dopo il timeout di inattività. 

   krimson#show isdn active

   --------------------------------------------------------------------------------
   ISDN ACTIVE CALLS

   --------------------------------------------------------------------------------
   Call Calling Called Remote Seconds Seconds Seconds Charges
   Type Number Number Name Used Left Idle
   Units/Currency

   --------------------------------------------------------------------------------
   Out 8114 kevin 120 1 118 0
   --------------------------------------------------------------------------------

   krimson#
   *Mar 4 15:29:41.738: BR0:1 DDR: idle timeout
   *Mar 4 15:29:41.742: BR0 DDR: has total 0 call(s), dial_out 0, dial_in 0
   *Mar 4 15:29:41.746: BR0:1 PPP: Treating connection as a callout
   *Mar 4 15:29:41.750: %DIALER-6-UNBIND: Interface BR0:1 unbound from profile
   Di0
   *Mar 4 15:29:41.754: BR0:1 DDR: disconnecting call
   *Mar 4 15:29:41.758: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected from
   8114 kevin, call lasted 121 seconds
   *Mar 4 15:29:41.774: ISDN BR0: TX -> DISCONNECT pd = 8 callref = 0x09
   *Mar 4 15:29:41.782: Cause i = 0x8090 - Normal call clearing
   *Mar 4 15:29:41.790: Di0 IPCP: Remove route to 10.9.9.2
   *Mar 4 15:29:41.862: ISDN BR0: RX <- RELEASE pd = 8 callref = 0x89
   *Mar 4 15:29:41.886: %LINK-3-UPDOWN: Interface BRI0:1, changed state to down
   *Mar 4 15:29:41.894: BR0:1 IPCP: State is Closed
   *Mar 4 15:29:41.894: BR0:1 PPP: Phase is TERMINATING [0 sess, 0 load]
   *Mar 4 15:29:41.898: BR0:1 LCP: State is Closed
   *Mar 4 15:29:41.898: BR0:1 PPP: Phase is DOWN [0 sess, 0 load]
   *Mar 4 15:29:41.902: BR0:1 DDR: disconnecting call
   *Mar 4 15:29:41.910: ISDN BR0: TX -> RELEASE_COMP pd = 8 callref = 0x09
   *Mar 4 15:29:42.886: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1,
   changed state to down

Lo stato iniziale è ora ripristinato. 

   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
   area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.48.74.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
   C 10.1.2.0/24 is directly connected, Serial0
   S 10.8.8.0/24 [1/0] via 10.1.2.2
   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.48.74.0/23 is directly connected, Ethernet0
   S* 0.0.0.0/0 [254/0] via 10.48.74.1

Informazioni correlate

Cronologia delle revisioni

Revisione Data di pubblicazione Commenti
1.0
04-Feb-2010
Versione iniziale

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