Hello everyone,
This post is about the 4G LTE link as backup. Please see below more details on this issue.
The customer configured the AR169EGW-LL router with the primary interface as Gigabit interface WAN and 4G LTE as backup line.
Everything is working great, but the switchover is happening only when the whole PRIMARY link is down. In the case when the primary link is UP but the ISP GATEWAY IS NOT RESPONDING, the switchover is not happening.
The solution to this issue is to additionally configure the NQA track. A quick guide for doing this can be find below:
<XXXX> system-view
[XXXX] nqa test-instance admin icmptest
[XXXX-GigabitEthernet0/0/4] test-type icmp
[XXXX-GigabitEthernet0/0/4] destination-address ipv4 [IP OF THE GATEWAY]
[XXXX-GigabitEthernet0/0/4] start now
[XXXX-GigabitEthernet0/0/4] quit
[XXXX] qos adaptation-profile test
[XXXX- qos-adaptation-profile-test] track nqa admin icmptest
[XXXX- qos-adaptation-profile-test] quit
[XXXX] interface Cellular0/0/0
[XXXX-Cellular0/0/0] standby track nqa admin icmptest
[XXXX-Cellular0/0/0] quit
[SE-BRO-RT01] display nqa results test-instance admin icmptest
The second issue arises when you trying to implement the above NQA track. It will not work if the WAN port is enabled, so, when configuring this, the standby interface Cellular0/0/0 should not exist on the primary link, the cellular interface should not be bound as standby on the primary link before this configuration should take place, otherwise the following error will popup:
[XXXX-Cellular0/0/0]standby track nqa admin icmptest
Error: A Backup Interface only can standby a track instance or main interface.
[XXXX-Cellular0/0/0]
In order for this to be solved, please refer to the above tips. Firstly execute the following command on the primary interface and then configure the above. After that you can put back the command:
undo standby interface Cellular0/0/0
That is all I want to share with you! Thank you!
