They can be used like loopback, but not limited to only 1 interface.
It's needed for bgp with multipath/ecmp to have a unique src ip

Signed-off-by: Alexandre Derumier <aderum...@odiso.com>
---
 src/PVE/INotify.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/PVE/INotify.pm b/src/PVE/INotify.pm
index bd2b15a..676dcc6 100644
--- a/src/PVE/INotify.pm
+++ b/src/PVE/INotify.pm
@@ -960,6 +960,7 @@ sub __read_etc_network_interfaces {
                        'bond_miimon' => 1,
                        'bond_xmit_hash_policy' => 1,
                        'bond-primary' => 1,
+                       'link-type'   => 1,
                        'uplink-id' => 1,
                        'vlan-protocol' => 1,
                        'vlan-raw-device' => 1,
@@ -1106,6 +1107,8 @@ sub __read_etc_network_interfaces {
                    my $tag = &$extract_ovs_option($d, 'tag');
                    $d->{ovs_tag} = $tag if defined($tag);
                }
+           } elsif (defined($d->{'link-type'})) {
+               $d->{type} = $d->{'link-type'} if $d->{'link-type'} eq 'dummy';
            }
        }
 
@@ -1658,6 +1661,7 @@ NETWORKDOC
 
     my $if_type_hash = {
        loopback => 100000,
+       dummy => 100000,
        eth => 200000,
        OVSPort => 200000,
        OVSIntPort => 300000,
-- 
2.20.1


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