User manual
6 PPP and MP configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
6-70 Nortel Networks Inc. Issue 5.3 (
30 March 2009)
Step 1 Check the CHAP configuration on two routers. If the user names of the server and the client
are the same, modify them to be different. In the SR8000, run the display interface command
to check the CHAP configuration.
Step 2 After modifying the CHAP configuration, restart the interfaces. In the SR8000, run the
shutdown command and the undo shutdown command, or use the restart command in the
interface view.
----End
6.13.4 MP configured through the VT works abnormally
Fault description
As shown in Figure 6-5,
Router C binds the three sub-channels of Serial1/0/0:0-2 to the VT11 through the ppp mp
virtual-template 11 command.
Router B binds the three sub-channels of Serial1/0/0:0-2 to the VT11 through the ppp mp
virtual-template 11 command.
Router A binds the six sub-channels of Serial1/0/0:0-2 and Serial1/0/1:0-2 to the VT11
through the ppp mp virtual-template 11 command.
After configuration, the MP cannot work normally.
Figure 6-5 Networking diagram of the MP configuration
RouterB
Serial1/0/0:0-2
RouterA
Serial1/0/0:0-2
Serial1/0/1:0-2
Serial1/0/0:0-2
RouterC
Fault analysis
The possible causes are:
z
Physical interfaces are bound into one MP in different modes.
z
Different interface boards or different interfaces are bound into one MP.
z
Number of bound physical interfaces in VT for interworking at two ends is different.
z
Many physical interfaces are bound in one local VT. The peer interfaces directly
connected to those physical interfaces have been bound into two or multiple VTs.
The six sub-channels are on an interface board, if direct binding to VT is adopted, the system
regards that the six sub-channels are bound to an MP. Actually, three sub-channels are
connected to Router C, and the other three ones are connected to Router B, which accords
with the fourth situation, and so the MP cannot work normally.
Troubleshooting procedure
Do as follows on the routers: