vyos@vyos:~$ show interfaces 
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
eth0             192.168.163.173/22                u/u  
eth1             -                                 A/D  
lo               127.0.0.1/8                       u/u  
                 ::1/128
vyos@vyos:~$ configure
[edit]
vyos@vyos# set interfaces bridge br0    
[edit]
vyos@vyos# set interfaces eth eth1 bridge-group bridge br0
[edit]
vyos@vyos# commit; save; exit
[ interfaces ethernet eth1 bridge-group ]
Adding interface eth1 to bridge br0

[ interfaces ethernet eth1 duplex auto ]
Cannot get current device settings: Operation not supported
  not setting autoneg

Saving configuration to '/config/config.boot'...
Done
exit
vyos@vyos:~$ show interfaces 
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
br0              -                                 u/D  
eth0             192.168.163.173/22                u/u  
eth1             -                                 u/D  
lo               127.0.0.1/8                       u/u  
                 ::1/128
vyos@vyos:~$ show bridge
bridge name     bridge id               STP enabled     interfaces
br0             0000.128a38ead978       no              eth1
vyos@vyos:~$ configure
[edit]
vyos@vyos# delete interfaces ethernet eth1 bridge-group bridge br0 
[edit]
vyos@vyos# commit
[ interfaces ethernet eth1 bridge-group ]
Use of uninitialized value $newbridge in string ne at /opt/vyatta/sbin/vyatta-bridge.pl line 88.
Use of uninitialized value $newbridge in concatenation (.) or string at /opt/vyatta/sbin/vyatta-bridge.pl line 89.
Moving interface eth1 from br0 to 
Use of uninitialized value $bridge in concatenation (.) or string at /opt/vyatta/sbin/vyatta-bridge.pl line 98.
Incorrect number of arguments for command
Usage: brctl addif <bridge> <device>    add interface to bridge

[[interfaces ethernet eth1]] failed
Commit failed
[edit]
vyos@vyos# exit discard
exit
vyos@vyos:~$ show interfaces 
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
br0              -                                 u/D  
eth0             192.168.163.173/22                u/u  
eth1             -                                 u/D  
lo               127.0.0.1/8                       u/u  
                 ::1/128
vyos@vyos:~$ show bridge 
bridge name     bridge id               STP enabled     interfaces
br0             0000.000000000000       no              
vyos@vyos:~$ show configuration 
interfaces {
    bridge br0 {
    }
    ethernet eth0 {
        address dhcp
    }
    ethernet eth1 {
        bridge-group {
            bridge br0
        }
    }
    loopback lo {
    }
}
service {
    ssh {
        port 22
    }
}
system {
    config-management {
        commit-revisions 20
    }
    console {
        device ttyS0 {
            speed 9600
        }
    }
    login {
        user vyos {
            authentication {
                encrypted-password ****************
                plaintext-password ****************
            }
            level admin
        }
    }
    ntp {
        server 0.pool.ntp.org {
        }
        server 1.pool.ntp.org {
        }
        server 2.pool.ntp.org {
        }
    }
    package {
        repository community {
            components main
            distribution helium
            url http://packages.vyos.net/vyos
        }
    }
    syslog {
        global {
            facility all {
                level notice
            }
            facility protocols {
                level debug
            }
        }
    }
}

vyos@vyos:~$ show version
Version:      VyOS 1.1.8
Description:  VyOS 1.1.8 (helium)
Copyright:    2017 VyOS maintainers and contributors
Built by:     maintainers@vyos.net
Built on:     Sat Nov 11 13:44:36 UTC 2017
Build ID:     1711111344-b483efc
System type:  x86 64-bit
Boot via:     image
Hypervisor:   KVM
HW model:     Standard PC (i440FX + PIIX, 1996)
HW S/N:       Not Specified
HW UUID:      6E85F253-B1E7-5F4A-A421-BBF9103DCE97
Uptime:       14:18:08 up 11 min,  2 users,  load average: 0.00, 0.02, 0.04