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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Backup Configuration of Dual Uplinks

Backup Configuration of Dual Uplinks

The AR router has two uplinks. If the two uplinks use PPPoE dialup, routing is used to implement backup of the two uplinks. For example, there are two dialup interfaces: Dialer1 and Dialer2. You can configure priorities of static routes to distinguish the primary and backup uplinks.

When PPPoE dialup fails, authentication fails, or an IP address fails to be obtained, the AR router needs to switch services to the backup route. The backup route takes effect only when Dialer1 becomes Down. The dialer interface is a virtual logical interface and is Snoofing Up. Even if PPPoE dialup fails, the dialer interface cannot become Down. The following configuration can be performed to solve this problem:

[Huawei] acl 3000   //Create an ACL.
[Huawei-acl-adv-3000] rule permit ip    //Generally, all users are allowed. You can also limit user access according to actual networking.
[Huawei-acl-adv-3000] quit
[Huawei] interface dialer 1  //Create a dialer interface.
[Huawei-Dialer1] link-protocol ppp
[Huawei-Dialer1] ppp chap user 123456     //Configure the CHAP authentication user name.
[Huawei-Dialer1] ppp chap password cipher huawei@123    //Configure the CHAP authentication password.
[Huawei-Dialer1] ppp pap local-user 123456 password cipher huawei@123     //Configure the PAP authentication user name and password.
[Huawei-Dialer1] ip address ppp-negotiate    //Configure PPP negotiation for obtaining an IP address.
[Huawei-Dialer1] dialer user user1
[Huawei-Dialer1] dialer bundle 1   //Specify dialer bundle 1.
[Huawei-Dialer1] dialer number 1 autodial     //The dialer interface becomes Down when PPPoE dialup fails.
[Huawei-Dialer1] dialer-group 1
[Huawei-Dialer1] nat outbound 3000   //Configure outbound NAT.
[Huawei-Dialer1] quit
[Huawei] dialer-rule
[Huawei-dialer-rule] dialer-rule 1 ip permit
[Huawei-dialer-rule] quit
[Huawei] interface  gigabitethernet 0/0/0    //Enter the view of the interface connected to the ISP network.
[Huawei-GigabitEthernet0/0/0] pppoe-client dial-bundle-number 1  //Enable the PPPoE client function and bind the PPPoE client to the dialer interface.
[Huawei-GigabitEthernet0/0/0] quit
[Huawei] ip route-static dialer 1 preference 60  //Create the default route pointing to the dialer interface. When the primary uplink is normal, services are transmitted to the external network through dialer1 preferentially.
[Huawei] ip route-static dialer 2 preference 100   //When the primary uplink is abnormal, services are transmitted to the external network through dialer2.
Updated: 2019-08-09

Document ID: EDOC1000079719

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