Nortel Networks 8000 - Manual (Page 194)

6 PPP and MP configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
ppp authentication-mode pap
ppp pap local-user rtbpap password simple rtbpap
ppp mp
#
interface Serial1/0/1
link-protocol ppp
ppp authentication-mode chap
ppp chap user rtbchap
ppp chap password simple chap
ppp mp
#
interface Virtual-Template0
ppp mp binding-mode authentication
ip address 8.1.1.2 255.255.255.0
#
aaa
local-user rtachap password simple chap
local-user rtapap password simple rtapap
authentication-scheme default
#
return
6.13 Troubleshooting
This section provides troubleshooting methods for the following faults:
• Physical link is not in the up state
• Link is always in the down state
• CHAP authentication of a PPP link fails
• MP configured through the VT works abnormally
6.13.1 Physical link is not in the up state
Fault description
Using the display interface command to check the current state of the interface, the physical
link cannot change into the state of Up.
Serial3/1/0 current state : DOWN
Line protocol current state : DOWN
Fault analysis
The possible causes are:
• The interfaces are not connected correctly or the contact is poor.
• The physical attributes configured on the interfaces of the both ends are not consistent.
Troubleshooting procedure
Do as follows on the routers:
6-68 Nortel Networks Inc. Issue 5.3 (30 March 2009)