Troubleshooting Ppp Configuration - 3Com MSR 50 Series Configuration Manual

392 C 19: PPP
HAPTER AND
Troubleshooting PPP
Configuration
MP C
ONFIGURATION
0.00% packet loss
round-trip min/avg/max = 29/29/31 ms
Note that in this approach to MP binding, all users are bound together and the
concept of virtual access is not involved.
Symptom 1: Link never turns into up state.
Solution: This problem may arise because of the PPP authentication failure due to
the incorrect configuration of PPP authentication parameters.
Enable the debugging of PPP, and you will see the information describing that LCP
went up upon a successful LCP negotiation but went down after the PAP or CHAP
negotiation.
Symptom 2: Physical link failed in going up.
Solution: Execute the display interface serial type number command to view
the current interface statuses, including:
serial number is administratively down, line protocol is down", which indicates
that the interface has been shut down by the administrator.
serial number is down, line protocol is down", which indicates that the interface is
not active or the physical layer has not gone up yet.
Virtual-template number is down, line protocol is spoofing up", which indicates
that this interface is a dialer interface and the call establishment attempt has
failed.
serial number is up, line protocol is up", which indicates that the link negotiation,
i.e., the LCP negotiation on this interface has succeeded.
serial number is up, line protocol is down", which indicates that this interface is
active, but link negotiation has failed.