Huawei v200r001 user manual Troubleshooting DDR, Configure Dialer-list, DDR Fault Diagnosis

User Manual - Configuration Guide (Volume 3)	Chapter 1
Versatile Routing Platform	DDR Configuration

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:

zFor an uninteresting message, if no dial link has been established to send the message, DDR will discard the message;

zFor an interesting message, if no dial link is available to send the message, DDR will dial and cache the message;

zIf 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:

zDirectly configured to protocol;

zConfigured 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:

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