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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 1
DDR Configuration
1-75
Quidway(config-if-Bri0)# dialer string 8810148
Quidway(config-if-Bri0)# encapsulation ppp
Quidway(config-if-Bri0)# ppp authentication chap
Quidway(config-if-Bri0)# ppp chap host remoteuser1
1.7.6 Configure Dialer-list
Dialer-list is configured in global configuration mode, and, when combined with dialer-
group, is used by DDR to determine whether the datagram sent is an interesting
message. DDR processes the sent datagram in the following ways:
z For an uninteresting message, if no dial link has been established to send the
message, DDR will discard the message;
z For an interesting message, if no dial link is available to send the message, DDR
will dial and cache the message;
z If a dial link is available to send the message, then no matter whether the message
is interesting or not, DDR will send the message on this dial link.
Dialer-list is configured in two modes:
z
Directly configured to protocol;
z Configured through access-list;
The above two configuration modes cannot be used at the same time, that is, one
dialer-list can be configured in only one mode, as exemplified below:
Example 1: in the dialer-list directly configured to protocol, IP message is interesting
and IPX message is uninteresting.
Quidway(config)# dialer-list 1 protocol ip permit
Quidway(config)# dialer-list 1 protocol ipx deny
Example 2: in dialer-list configured through access-list, all IP messages except rip
message are interesting.
Quidway(config)# access-list deny udp any eq rip any eq rip
Quidway(config)# access-list 101 permit ip any any
Quidway(config)# dialer-list 1 list 101
1.8 Troubleshooting DDR
1.8.1 DDR Fault Diagnosis
Causes for common DDR faults can be diagnosed from the following aspects:
I. Whether modem is normal
If Modem is abnormal, like persistent noise or busy tone, then try to return it to normal
by executing shutdown and no shutdown commands at the physical interface
connected to Modem. If this operation fails, then try to return it to normal by executing
AT command string at the physical interface connected to Modem. For example: