Bonding issue

Hi all.
I use a RB2011UiAS behind my firewall as a switch.
Connected to this on 2x Gbit i have my NAS which is also 2x Gbit. On the NAS i have Link aggregation configured in Load-Balance mode…i Intend to make it 802.3ad.
I did the same on the microtik but i lost the connection:

  • removed port 4-5 from the default bridge
  • create new bridge and add those 2 ports.
  • create bonding with port 4 and 5 and apply.

Also the latency is quite big (80ms) even if is cable link ~1m

I loose connection once i do this.
any