how to make sure bridge interface is up with netplan after reboot

[mabi]

That's correct I have no IP addresses defined on my xenbr1 bridge because it is just a bridge between my Xen virtual machines which are hooked up to this bridge and a hardware firewall which is connected onto the eno3 physical NIC. Both VM and firewall have an IP address but not the bridge. So it looks like this:

[VM(eth0)]-----[(xenbr1)XenHypervisor(eno3)]-----[(eth0)Firewall(eth1)]-----[Internet]

As far as I am concerned the xenbr1 bridge interface on my Xen hypervisor does not need any IP address, there is no purpose for it having an IP address.

In the /run/systemd/network directory there is no xenbr1.network file but there is a eno3.network file with the following content:

[Match]
Name=eno3

[Network]
Bridge=xenbr1
LinkLocalAddressing=no
IPv6AcceptRA=no

​

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On March 9, 2018 7:19 PM, Tom H <tomh0665 at gmail.com> wrote:

> ​​
> 
> On Fri, Mar 9, 2018 at 10:34 AM, mabi via ubuntu-users
> 
> ubuntu-users at lists.ubuntu.com wrote:
> 
> > I am using Ubuntu 17.10 and therefore Netplan which I have configured
> > 
> > a bridge for a specific network interface for my Xen virtual machines.
> > 
> > Unfortunately when I reboot the server that bridge interface is in
> > 
> > state DOWN so that I have to manually set it up using "ip link set
> > 
> > xenbr1 up" command. Now does anyone know how to make sure netplan
> > 
> > brings my bridge interface automatically up at reboot?
> > 
> > Here is the relevant part of my netplan netcfg.yaml file:
> > 
> > network:
> > 
> > version: 2
> > 
> > renderer: networkd
> > 
> > ethernets:
> > 
> > eno3:
> > 
> > dhcp4: no
> > 
> > bridges:
> > 
> > xenbr1:
> > 
> > interfaces: \[eno3\]
> > 
> > dhcp4: no
> > 
> > parameters:
> > 
> > stp: no
> > 
> > forward-delay: 0
> 
> You have "dhcp4: no" and no "addresses:" defined so I wouldn't expect
> 
> xenbr1 to be "UP".
> 
> What do the "*.network" files in "/run/systemd/" contain?
> 
> 
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