ADWAN controller (CTL) alarm link packet loss rate 100% experience case

As shown in the figure below, the packet loss rate of the link is 100%

1. First, on the controller (CTL), go to the Physical Network-Link-Link Management page to acknowledge that all quality probe results are successful. If they fail, click Redistribute.

2. On the device, check whether the NQA configuration is properly distributed (note the distinction between the server side and client side).

·Server side (P1):

<P1> display current-configuration | inc nqa

nqa server enable

nqa server udp-echo ipv6 72::112:1:1 10000 high-performance-mode

#

·Client side (P2):

<P2> display current-configuration 

……

#

nqa entry admin f005ed9c43954a8c89a948d64a0b4d3f

type udp-jitter

destination ipv6 72::112:1:1

destination port 10000

frequency 3000

high-performance-mode enable

probe packet-interval 80

probe packet-number 100

probe packet-timeout 1600

source ipv6 72::112:1:2

#

nqa schedule admin f005ed9c43954a8c89a948d6 4a0b4d3f start-time now lifetime forever

#

3. If the device lacks NQA configurations, audit the device configuration to see if the controller (CTL) has more configurations than the device. As shown in the figure below, there are undistributed configurations. Click Data Sync.

4. After acknowledging the device configuration is normal, check the results on the device using display nqa statistics. If the packet loss rate data shows 100%, investigate the specific cause on the device side.

[MSR5620]display nqa statistics
NQA entry (admin admin, tag e30d17b16a8b4f1088fed968c4cacba2) test statistics:
  NO. : 3638
    Start time: 2025-03-13 15:28:28.5 
    Life time: 1979 seconds
    Send operation times: 4950           Receive response times: 0 
    Min/Max/Average round trip time: 0/0/0 
    Square-Sum of round trip time: 0 
  Extended results:
    Packet loss ratio: 100.0% 
    Failures due to timeout: 4950
    Failures due to internal error: 0
    Failures due to other errors: 0
    Packets out of sequence: 0
    Packets arrived late: 0

On-site inspection at the client end showed normal packet loss rates on some links, while others had a 100% packet loss rate. The device side detected a faulty switch fabric module on the peer device. After replacement, the packet loss rate recovered.