HP 7102dl - ProCurve Secure Router Configuration Manual page 79

C a u t i o n
PPP. Common PPP problems include:
mismatched DS0 or E0 channels
incorrect authentication information
incompatible network-level protocols
Use the debug commands shown in Table 2-1 to determine where the PPP
session establishment ends. A good strategy can be to first view only the errors
and then pinpoint the problem from there.
Messages resulting from debug ppp commands consume processing power
and in a live network may compromise network functions.
Table 2-1. PPP Debug Commands
Command Syntax
debug ppp verbose
debug ppp negotiation
debug ppp authentication
debug ppp errors
You can also view the status of an interface by entering show interface ppp
<interface number>.
If the LCP state does not open, the E1-carrier or T1-carrier lines have probably
been assigned an incorrect channel range. (This is properly a Physical Layer
problem but often does not show itself until peers exchange LCP frames.)
If you receive an authentication error and repeated Challenge Handshake
Authenticate Protocol (CHAP) or Password Authentication Protocol (PAP)
messages, you should check the router's authentication information.
If you see NCP negotiation errors or if the LCP opens, but the PPP session
does not, determine which network protocol the peer uses. You may be using
incompatible protocols.
For more information about troubleshooting PPP and PPP authentication, see
the Basic Management and Configuration Guide, Chapter 6: Configuring
the Data Link Layer Protocol for E1, T1, and Serial Interfaces.
Frame Relay. Enter show frame-relay lmi to view the link management
interface (LMI) statistics.
View
all PPP debug messages
PPP messages dealing with negotiation of the link
PPP messages dealing with authentication
errors and mismatches in negotiation and authentication
Increasing Bandwidth
Troubleshooting Multilinks
2-13