Problem With Network Devices On Boot

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hello,

I have a question about network devices ??

on my systems CentOS 7.5 I have a Problem with starting Network devices!

I set up two servers with KVM on the first I have 6 KVM installed Systems on the second I have 5 KVM installed systems?

When I have to reboot my system (Kernel update….) the most time one Network Device is missing on the KVM Clients (eth0)

I have configured my system with I/O Shared Network like this

xxx.xml




and a second one!

………
………… This Interfaces are always starting

But I have also a Bridge on the systems (eth0) configure for internal Networking (DNS, LDAP…..)


This interface is failing the most time on some KVM Installs!!

I have always to check is the Interface starting or not??

AFter 2 or 3 reboot with

virsh reboot xxxxx

the system is starting most time with the third Interface !

Can any tell me why this Problem exist??

Thanks for a answer,