Vitaliy, We're running several replication jobs and all of them hammer our layer 3 network, not our layer 2 replication network. I have configured the preferred network setting as our Layer 2 intra-datacentre replication link subnet.
If i observe the NIC's on the destination backup proxy - the Layer 3 generic 20Mbit WAN Interface maxes out. Our 40 Mbit replication network - for dedicated inter-data centre traffic (backup and replication only) is barely utilised.
We have two physical backup proxies, one in each Data centre, both with two NIC's - they can see each other on each NIC. The layer 2 network is a spanned VLAN between two geographic locations ( ie no gateway ). The servers think they are on the same peice of wire. Yet its never utilised. Thoughts ?