Redundant Virtual Router support in Isolated network with network mode set to Routed Dynamic

### Feature request

At the moment, the _Isolated network with Routed Dynamic network mode_ only supports running with a single virtual router. This means in the event of a host or VM failure, there will be a network outache of about 5 to 7 minutes. This virtual router is the default gateway of all VM's in this network, so the impact can mean downtime and loss of services (DHCP, DNS, networking).

### Solution

It would be great to have the same implementation as the "natted" virtual router type where keepalived is used between an active and passive virtual router in order to give redundancy.

Commencez par retracer le réseau Isolated avec l’implémentation Routed Dynamic virtual-router et comparez-la à l’implémentation natted virtual-router qui utilise keepalived. Le travail est terminé lorsque des virtual-router actifs/passifs assurent la redondance, de sorte qu’une défaillance de l’hôte ou de la VM n’interrompe pas la passerelle par défaut, DHCP, DNS ou le réseau.

Rédigé par le modèle d'indexation à partir du texte de l'issue.