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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 1
DDR Configuration
1-80
1) Hardware
z Whether modem is connected correctly.
z Whether modem is initialized correctly, whether it is set as non-automatic answer.
Refer to Modem section of this manual for details.
z Whether the telephone line is connected correctly.
6) Software
z If the interface is synchronous/asynchronous, it is not set as asynchronous mode.
z The modem in and modem out commands are not configured.
z
DDR is not enabled.
Fault 3: when the Modem is connected, the opposite party still cannot be pinged
through.
Troubleshooting: the cause may be one of the followings:
z Whether the encapsulation of two ends is consistent.
z If encapsulation ppp is used, whether the authentication is configured correctly at
both ends.
z DDR is not enabled.
z The receiving end is configured with dialer map, but there is no dialer map
matching the calling end.
1.8.3 Troubleshooting with DDR Debugging Information
I. How to acquire DDR debugging information
Execute the following commands in privileged user mode, to see DDR debugging
information:
Quidway# debug dialer event
Quidway# debug dialer packet
Quidway(config)# logging on
II. The debugging information displayed when DDR can interwork with the
opposite end
Information displayed at the calling end:
DDR try to find routing to 100.1.1.2 on interface Serial0
DDR
it is an interesting packet
DDR
Find a dialer map matching the address
DDR
Try to find a free channel to dial 8810052 on the interface
DDR
Dialing 8810052 on interface Serial0 of interface Serial0
DDR
Enqueue this packet
DDR
try to find routing to 100.1.1.2 on interface Serial0
DDR
it is an interesting packet
DDR
Find a dialer map matching the address
DDR
A link is connecting by this dialer map, waiting this link
DDR
Enqueue this packet
DDR
try to find routing to 100.1.1.2 on interface Serial0
DDR
it is an interesting packet
DDR
Find a dialer map matching the address
DDR
A link is connecting by this dialer map, waiting this link
DDR
Enqueue this packet
DDR
try to find routing to 100.1.1.2 on interface Serial0
DDR
it is an interesting packet
DDR
Find a dialer map matching the address