6-62
Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Troubleshooting Logical Interfaces
Note Debug commands are processor intensive.
Table 6-12 lists the debug commands you can use to monitor PPP interfaces.
Table 6-12. Debug commands for PPP Interfaces
For example, if the status of the NCP is stopped, you may want to enter the
debug ppp negotiations command. You should be able to see each stage in
the process of establishing a PPP connection. Figure 6-23 shows the debug
messages when a PPP connection is established successfully.
Command Explanation
debug ppp verbose displays detailed information about all PPP frames as they
arrive on or are sent from the PPP interface
debug ppp errors displays error messages relating to PPP
debug ppp negotiation displays events relating to link negotiation; shows if link
protocols are able to open; reveals when negotiations
between two PPP peers fail
debug ppp authentication displays real-time messages relating to PAP and CHAP
undebug all turns off debug messages
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