ESR series service routers.ESR-Series. User manual
esr(config)# interface gigabitethernet 1/0/2.828
esr(config-subif)# bridge-group 1
esr(config-subif)# exit 
8.11  Dual-Homing configuration
Dual-Homing is a technology based on redundant links that creates a secure connection in order to prevent 
failures of the key network resources.
8.11.1  Configuration algorithm
Step Description Command Keys
1 Specify a redundant interface to which 
the switching will occur when the 
connection is lost on a primary one.
esr(config-if-gi)# backup 
interface<IF> vlan <VID>
<IF> – interface to which the 
switching will be.
<VID> – VLAN ID, set in the 
range of [2..4094].
The parameter can also be 
specified by the range with '-' or 
by comma-separated list.
2 Specify the number of packets copies 
with the same MAC address that will be 
sent to an active interface when 
switching (optional).
esr(config)# backup-interface 
mac-duplicate <COUNT>
<COUNT> – amount of packets 
copies, takes values of [1..4].
3 Specify the number of packets per 
second that will be sent to an active 
interface when switching (optional).
esr(config)# backup-interfacemac-
per-second<COUNT>
<COUNT> – amount of MAC 
addresses per second, takes 
value of [50..400].
4 Specify that it is necessary to carry out 
the switching to the primary interface 
when restoring the communication 
(optional).
esr(config)# backup-interface 
preemption
When adding the second VLAN tag to an Ethernet frame, its size is increased by 4 bytes. MTU must 
be increased by 4 bytes or more on the gigabitethernet 1/0/2 router interface and on all equipment 
transmitting Q-in-Q frames.
In the current firmware version, this functionality is supported only by ESR-1000 router.