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Additional info for Cisco - Troubleshooting ISDN
Example text
The Prefix Issue • Without PAP or CHAP Router 54321 Left 1st Call (from 40854321) 2nd Call (to 54321) 54321 Router Right 54321 Not Yet Connected 12345 • With PAP or CHAP Router 54321 Left Call (from 40854321) 54321 209 0913_04F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. 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.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 60 30 LCP Negotiation • Configure-Req proposes certain options • If all options are acceptable, the remote station returns a Configure-ACK Configure-Req Troubleshooting Ping remote int Debug dialer Sh isdn stat Debug PPP LCP Speed 56/64 Pap/chap NCP Ping remote net Tune cost Configure-ACK 209 0913_04F9_c2 61 © 1999, Cisco Systems, Inc. LCP Negotiation • In reality all PPP negotiations are double negotiations Configure-Req Configure-ACK Configure-Req Configure-ACK 209 0913_04F9_c2 © 1999, Cisco Systems, Inc.
All rights reserved. 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.
Cisco - Troubleshooting ISDN
by Brian
4.3