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Cisco - Troubleshooting ISDN

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3 • Now that we con ping the remote ISDN interface, we can look at routing issues 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. 1 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 3 83 © 1999, Cisco Systems, Inc. 255 dialer-list 1 list 101 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 84 42 Show ISDN History Router#sh isdn hist ------------------------------------------------------------ISDN CALL HISTORY ------------------------------------------------------------History Table MaxLength = 100 entries History Retain Timer = 15 Minutes ------------------------------------------------------------------------Call Calling Called Duration Remote Time until Type Number Number Seconds Name Disconnect ------------------------------------------------------------------------Out 01234 220 Paris Out 04567 521 LA Out 345 Failed In 43078 320 Orlando In 785601 Active(57) Brussels 209 0913_04F9_c2 85 © 1999, Cisco Systems, Inc.

Printed in USA. scr Router Right Left Already Connected 12345 74 37 The Prefix Issue • PAP/CHAP enables you to know which site is connected • Without PAP or CHAP, this would be based on the ISDN calling number This is often problematic Calling number may not be present Calling number may be presented with/without prefixes Troubleshooting Ping remote int Debug dialer Sh isdn stat Debug PPP LCP Speed 56/64 Pap/chap NCP Ping remote net Tune cost • The net result is that without PAP or CHAP you would open two half-duplex B channels (instead of one full duplex) 209 0913_04F9_c2 75 © 1999, Cisco Systems, Inc.

All rights reserved. Printed in USA. scr 62 31 Debug PPP Packet: LCP ACK • PPP BRI: B-Channel 1: I LCP CONFREQ(1) id 2 (4) • PPP BRI: B-Channel 1: O LCP CONFACK(2) id 2 (4) 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. 63 Debug PPP Negotiation ppp: sending CONFREQ, type = 3 (CI_AUTHTYPE), value = C023/0 ppp: sending CONFREQ, type = 5 (CI_MAGICNUMBER), value = 8C01B4 ppp: config ACK received, type = 3 (CI_AUTHTYPE), value = C023 ppp: config ACK received, type = 5 (CI_MAGICNUMBER), value = 8C01B4 209 0913_04F9_c2 © 1999, Cisco Systems, Inc.

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