Domain XML and VLAN tagging

[Peter Krempa]

On Thu, Jun 16, 2022 at 09:20:21 +0200, Gionatan Danti wrote:
> Hi all,
> from here [1]:
> 
> "Network connections that support guest-transparent VLAN tagging include 1)
> type='bridge' interfaces connected to an Open vSwitch bridge Since 0.10.0 ,
> 2) SRIOV Virtual Functions (VF) used via type='hostdev' (direct device
> assignment) Since 0.10.0 , and 3) SRIOV VFs used via type='direct' with
> mode='passthrough' (macvtap "passthru" mode) Since 1.3.5 . All other
> connection types, including standard linux bridges and libvirt's own virtual
> networks, do not support it."
> 
> I read it correctly that when used on a classical linux bridge these vlan
> tags does nothing? If so, it is due to something related to the underlying
> bridge device (ie: incomplete support for vlan filtering) or it is because
> libvirt lacks the necessary "plumbing" to use advanced bridge features?

AFAIK it was simply never implemented. There's also an upstream feature
request for this:

https://gitlab.com/libvirt/libvirt/-/issues/157

> 
> Thanks.
> 
> [1] https://libvirt.org/formatdomain.html#setting-vlan-tag-on-supported-network-types-only
> 
> -- 
> Danti Gionatan
> Supporto Tecnico
> Assyoma S.r.l. - www.assyoma.it
> email: g.danti at assyoma.it - info at assyoma.it
> GPG public key ID: FF5F32A8
>