I implemented the same and it worked for me without any performance issue complained so far but we're facing a lot of retransmission, duplicated packets received in the other end, packets being sent to both interfaces even if the destination is a known mac-address listed in show bridge-domain table, excessive amount of multicast. Did you experienced the same? In my case I have redundant Checkpoint firewalls in the other end and couldn't find the reason of this behavior.
I'll list below some shows I think it'd help you to understand.
!## members of bridge-domain ##
Bridge-domain 100 (3 ports in all)
State: UP Mac learning: Enabled
Aging-Timer: 300 second(s)
BDI100 (up)
GigabitEthernet0/0/3 service instance 100
GigabitEthernet0/0/4 service instance 100
!## show interfaces ##
GigabitEthernet0/0/3 is up, line protocol is up
Hardware is 6XGE-BUILT-IN, address is <mac-address>
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 14/255, rxload 21/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is force-up, media type is T
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 3d18h, output 00:05:20, output hang never
Last clearing of "show interface" counters 2d05h
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 85563000 bits/sec, 20818 packets/sec
5 minute output rate 56228000 bits/sec, 19891 packets/sec
2349572630 packets input, 1387111196441 bytes, 0 no buffer
Received 3188 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1453078 multicast, 0 pause input
2133773997 packets output, 1035365749547 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
GigabitEthernet0/0/4 is up, line protocol is up
Hardware is 6XGE-BUILT-IN, address is <mac-address>
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 10/255, rxload 30/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is T
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 3d19h, output 00:05:21, output hang never
Last clearing of "show interface" counters 2d05h
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 117701000 bits/sec, 18131 packets/sec
5 minute output rate 40887000 bits/sec, 14102 packets/sec
1686231805 packets input, 1248717736692 bytes, 0 no buffer
Received 7 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1480020 multicast, 0 pause input
1547107873 packets output, 799906960922 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
!## sh int sum ## - There are much more bits/packets sent/received in the physical interfaces than in the BDI, is it an expected behavior?
IHQ: pkts in input hold queue IQD: pkts dropped from input queue
OHQ: pkts in output hold queue OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)
TRTL: throttle count
Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
-----------------------------------------------------------------------------------------------------------------
* GigabitEthernet0/0/3 0 0 0 0 85435000 20962 54889000 19862 0
* GigabitEthernet0/0/4 0 0 0 0 115482000 17832 39649000 14087 0
* BDI100 0 0 0 0 159956000 24672 54757000 19790 0
