my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
if ($v0 ne $v1) {
my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
if ($v0 ne $v1) {