udpcon's questions

I have tried to set up bonding between two switches that link to one switch that is linked to a camera (10.0.10.10):

Camera
  |
  |
Switch 1 - - - - - - - - 
  |                    |
  | A                  | B
  |                    |
Switch Primary      Switch Secondary
  |                    |
C | enp3s4f0         D | enp3s4f1 
  |                    |
  |                    |
 ---------------------------
 |Ubuntu 18.04             |
 |       bond0             |
 |------------------------ |

The goal is to be able to ping the camera if any of connections A/B/C/D die. Currently, if connection A dies, the camera cannot be pinged. If any other connection fails, it can still ping the camera.

This is my 01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s4f0:
      addresses: [ ]
    enp3s4f1:
      addresses: [ ]
    bonds:
      bond0:
        addresses: [ 10.0.10.101/24 ]
        gateway4: 10.0.10.10
        nameservers:
          addresses: [ 1.1.1.1, 1.1.1.0 ]
        interfaces: [ enp3s4f0, enp3s4f1 ]
        parameters:
          mode: active-backup
          primary: enp3s4f0

After applying the netplan, no errors are thrown:

sudo netplan apply

The problem is that when A is disconnected, the server still recognizes connection C as active so the bond does not change its interface and therefore it keeps trying to reach the camera from Primary Switch, which isn’t possible.