John, On R2, the client, set your enable-timeout to about 5 seconds, and on R5, the server, add "dialer wait-for-carrier" of 10 or 11 seconds (at least double the client's enable-timeout.
HTH, Kym >From: "John Tafasi" >Reply-To: "John Tafasi" >To: "Cisco Group Study" , "ccielab" > >Subject: Isdn callback problem >Date: Wed, 18 Dec 2002 00:54:27 -0700 > >Hi group, > >I have r2 which is configured to request callback from r5. The problem is >that r2 does not wait for r5 to callback and will repeat the calling r5 and >request callback. However r5 will eventually succeed and callback r2. My >question is how can you prevent r2 from repeating the call to r5? I have >pasted below the configuration for both routers and the output of "debug >isdn q931" and "debug ppp authentication" on r2. > > >r2#show run > ! >version 11.3 > ! >hostname r2 >! > username r5 password 7 13061E010803 >ip subnet-zero >no ip domain-lookup >isdn switch-type basic-ni1 >! > ! >interface BRI0 > no ip address > no ip directed-broadcast > encapsulation ppp > dialer pool-member 1 > isdn spid1 0835866101 > isdn spid2 0835866301 > ppp callback request >! >interface Dialer1 > ip address 10.10.10.1 255.255.255.0 > no ip directed-broadcast > encapsulation ppp > dialer remote-name r5 > dialer enable-timeout 1000 > dialer string 8358662 > dialer hold-queue 100 timeout 30 > dialer pool 1 > dialer-group 1 > ntp broadcast > pulse-time 0 > ppp authentication chap >! > ! >map-class dialer eng >access-list 1 deny any >access-list 100 permit tcp any any eq telnet >access-list 100 permit icmp any any >dialer-list 1 protocol ip list 100 >! >line con 0 > exec-timeout 0 0 > logging synchronous > transport input none >line aux 0 >line vty 0 4 > exec-timeout 0 0 > password 7 06101B38 > login > telnet break-on-ip > telnet ip-on-break >! >ntp clock-period 17179853 >end > >r2# > >================= > >r5#show run > version 12.2 >! >hostname r5 > username r2 password 7 045802150C2E > no ip domain-lookup >! > isdn switch-type basic-ni >! >! >! >! > ! >interface BRI0 > ip address 10.10.10.2 255.255.255.0 > encapsulation ppp > dialer callback-secure > dialer map ip 10.10.10.1 name r2 class eng broadcast 8358661 > dialer-group 1 > isdn switch-type basic-ni > isdn spid1 0835866201 > isdn spid2 0835866401 > cdapi buffers regular 0 > cdapi buffers raw 0 > cdapi buffers large 0 > ppp callback accept > ppp authentication chap > ppp chap hostname r5 >! > ! >map-class dialer eng > dialer callback-server username > access-list 100 permit tcp any any eq telnet >access-list 100 permit icmp any any >dialer-list 1 protocol ip list 100 >! >! >line con 0 > exec-timeout 0 0 > logging synchronous > transport input none >line aux 0 >line vty 0 4 > password 7 045802150C2E > login > autocommand access-enable host timeout 5 >! >ntp clock-period 17179628 >ntp master 4 >ntp peer 10.10.110.16 >end > >r5# > >============== >r2#show debug >ISDN: > ISDN Q931 packets debugging is on >r2#debu ppp authen >PPP authentication debugging is on >r2# >r2#ping 10.10.10.2 > >Type escape sequence to abort. >Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds: >..... >Success rate is 0 percent (0/5) >r2# >.Mar 2 11:01:03.477: ISDN BR0: TX -> SETUP pd = 8 callref = 0x04 >.Mar 2 11:01:03.481: Bearer Capability i = 0x8890 >.Mar 2 11:01:03.485: Channel ID i = 0x83 >.Mar 2 11:01:03.485: Keypad Facility i = '8358662' >.Mar 2 11:01:03.529: ISDN BR0: RX .Mar 2 11:01:03.529: Channel ID i = 0x89 >.Mar 2 11:01:03.681: ISDN BR0: RX .Mar 2 11:01:03.693: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up >.Mar 2 11:01:03.721: %DIALER-6-BIND: Interface BRI0:1 bound to profile >Dialer1 >.Mar 2 11:01:03.733: BR0:1 PPP: Treating connection as a callout >.Mar 2 11:01:03.733: ISDN BR0: TX -> CONNECT_ACK pd = 8 callref = 0x04 >.Mar 2 11:01:05.797: BR0:1 PPP: Phase is AUTHENTICATING, by the peer >.Mar 2 11:01:07.653: BR0:1 PPP: Phase is AUTHENTICATING, by the peer >.Mar 2 11:01:07.673: BR0:1 CHAP: I CHALLENGE id 195 len 23 from "r5" >.Mar 2 11:01:07.681: BR0:1 CHAP: O RESPONSE id 195 len 23 from "r2" >.Mar 2 11:01:07.705: BR0:1 CHAP: I SUCCESS id 195 len 4 >.Mar 2 11:01:07.769: %LINEPROTO-5-UPDOWN: Line protocol on Interface >BRI0:1, changed state to up >.Mar 2 11:01:07.777: ISDN BR0: RX .Mar 2 11:01:07.777: Cause i = 0x8090 - Normal call clearing >.Mar 2 11:01:07.797: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected >from 8358662 , call lasted 4 seconds >.Mar 2 11:01:07.801: %LINK-3-UPDOWN: Interface BRI0:1, changed state to >down >.Mar 2 11:01:07.833: %DIALER-6-UNBIND: Interface BRI0:1 unbound from >profile Dialer1 >.Mar 2 11:01:07.837: ISDN BR0: TX -> RELEASE pd = 8 callref = 0x04 >.Mar 2 11:01:07.857: ISDN BR0: RX .Mar 2 11:01:08.773: %LINEPROTO-5-UPDOWN: Line protocol on Interface >BRI0:1, changed state to down >.Mar 2 11:01:09.477: ISDN BR0: TX -> SETUP pd = 8 callref = 0x05 >.Mar 2 11:01:09.481: Bearer Capability i = 0x8890 >.Mar 2 11:01:09.481: Channel ID i = 0x83 >.Mar 2 11:01:09.485: Keypad Facility i = '8358662' >.Mar 2 11:01:09.525: ISDN BR0: RX .Mar 2 11:01:09.529: Channel ID i = 0x89 >.Mar 2 11:01:09.689: ISDN BR0: RX .Mar 2 11:01:09.705: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up >.Mar 2 11:01:09.733: %DIALER-6-BIND: Interface BRI0:1 bound to profile >Dialer1 >.Mar 2 11:01:09.741: BR0:1 PPP: Treating connection as a callout >.Mar 2 11:01:09.745: ISDN BR0: TX -> CONNECT_ACK pd = 8 callref = 0x05 >.Mar 2 11:01:11.809: BR0:1 PPP: Phase is AUTHENTICATING, by the peer >.Mar 2 11:01:13.657: BR0:1 PPP: Phase is AUTHENTICATING, by the peer >.Mar 2 11:01:13.681: BR0:1 CHAP: I CHALLENGE id 196 len 23 from "r5" >.Mar 2 11:01:13.689: BR0:1 CHAP: O RESPONSE id 196 len 23 from "r2" >.Mar 2 11:01:13.709: BR0:1 CHAP: I SUCCESS id 196 len 4 >.Mar 2 11:01:13.773: ISDN BR0: RX .Mar 2 11:01:13.777: Cause i = 0x8090 - Normal call clearing >.Mar 2 11:01:13.793: %ISDN-6-DISCONNECT: Interface BRI0:1 disconnected >from 8358662 , call lasted 4 seconds >.Mar 2 11:01:13.797: %LINK-3-UPDOWN: Interface BRI0:1, changed state to >down >.Mar 2 11:01:13.829: %DIALER-6-UNBIND: Interface BRI0:1 unbound from >profile Dialer1 >.Mar 2 11:01:13.837: ISDN BR0: TX -> RELEASE pd = 8 callref = 0x05 >.Mar 2 11:01:13.853: ISDN BR0: RX r2# >.Mar 2 11:01:22.785: ISDN BR0: RX .Mar 2 11:01:22.785: Bearer Capability i = 0x8890 >.Mar 2 11:01:22.789: Channel ID i = 0x89 >.Mar 2 11:01:22.793: Calling Party Number i = 0x80, '8358662' >.Mar 2 11:01:22.801: %DIALER-6-BIND: Interface BRI0:1 bound to profile >Dialer1 >.Mar 2 11:01:22.805: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up >r2# >.Mar 2 11:01:22.837: BR0:1 PPP: Treating connection as a callin >.Mar 2 11:01:22.849: ISDN BR0: TX -> CONNECT pd = 8 callref = 0x8E >.Mar 2 11:01:22.853: Channel ID i = 0x89 >.Mar 2 11:01:22.961: ISDN BR0: RX r2# >.Mar 2 11:01:26.889: BR0:1 PPP: Phase is AUTHENTICATING, by the peer >.Mar 2 11:01:26.901: BR0:1 CHAP: I CHALLENGE id 197 len 23 from "r5" >.Mar 2 11:01:26.909: BR0:1 CHAP: O RESPONSE id 197 len 23 from "r2" >.Mar 2 11:01:26.933: BR0:1 CHAP: I SUCCESS id 197 len 4 >r2# >.Mar 2 11:01:27.865: %LINEPROTO-5-UPDOWN: Line protocol on Interface >BRI0:1, changed state to up >r2# >.Mar 2 11:01:28.837: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to >8358662 8358662 >r2# >. _________________________________________________________________ Protect your PC - 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