Cisco - Troubleshooting Isdn

209 0913_04F9_c2 1 © 1999, Cisco Systems, Inc. Troubleshooting ISDN Session 209 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr 2 1 What You Should Know • BRI • T1 and E1 PRI • ISDN Protocol Architecture 209 0913_04F9_c2 3 © 1999, Cisco Systems, Inc. Basic Rate Access (BRI) • 2B + D • SO Interface B-CHANNEL B-CHANNEL BRI D-CHANNEL 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr 4 2 T1 Primary Rate Interface (PRI) • T1 PRI or S1 Interface • Used in North America and Japan • 23 B + D B-CHANNEL B-CHANNEL BRI D-CHANNEL 209 0913_04F9_c2 5 © 1999, Cisco Systems, Inc. E1 Primary Rate Interface (PRI) • E1 PRI or S2 Interface • Used in Europe • 30 B + D B-CHANNEL B-CHANNEL BRI D-CHANNEL 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr 6 3 ISDN Protocol Architecture Network Physical LAPD–Q.921 I.430 (BRI)–I.431 (PRI) Physical 209 0913_04F9_c2 Q.931 Data Link PPP D-Channel Network IP, … Data Link B-Channel 7 © 1999, Cisco Systems, Inc. Troubleshooting ISDN “ There are only two possible problems with IDSN: The first problem occurs when you try to install it. The second problem occurs when you receive the first invoice. 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr ” 8 4 Troubleshooting ISDN • Be systematic • Go step by step • Always troubleshoot both ends of the connection 209 0913_04F9_c2 9 © 1999, Cisco Systems, Inc. Troubleshooting Menu Troubleshooting Ping remote int Debug dialer Sh isdn stat Layer 1 Layer 2 Layer 3 Debug PPP LCP Speed 56/64 Pap/Chap NCP Ping remote net Tune cost 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr 10 5 Ping Remote ISDN Int ping 1.1.1.1 Ping remote int Ping remote net Tune cost ping 1.1.1.2 1.1.1.1 Troubleshooting ISDN 1.1.1.2 • Do not bother to look at routing or cost issues if that doesn’t work 209 0913_04F9_c2 11 © 1999, Cisco Systems, Inc. Debug Dialer Router# debug dialer events Dialing cause: BRIO: ip (s=172.16.1.111 d172.16.2.22) Troubleshooting Ping remote int Ping Debug remote dialer net Tune Sh isdn coststat Debug PPP Ping remote net Tune cost Router# debug dialer packets BRIO: ip (s=10.1.1.8, d=10.1.1.1), 100 bytes, interesting (ip PERMIT) 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr 12 6 SH ISDN Status Router#sh isdn status Troubleshooting ISDN BRIO interface Layer 1 Status : DEACTIVATED Layer 2 NOT Activated Layer 3 Status : No Active Layer 3 Call(s) Ping remote int Debug dialer Sh isdn stat Debug LayerPPP 1 PingLayer remote 2 net TuneLayer cost 3 Debug PPP Ping remote net Tune cost Activated dsl 0 CCBs are 0, Allocated = 0 209