How Link Aggregation Dynamic Mode Bonding Works; Which Physical Interface Is Preferred - HP StoreVirtual 4000 User Manual

Figure 27 Active-Passive failover in a four-switch topology
1. Servers
2. HP LeftHand Storage systems
3. Storage cluster
4. GigE trunk
5. Active path
6. Passive path
Figure 27 (page 57)

How link aggregation dynamic mode bonding works

Link Aggregation Dynamic Mode allows the storage system to use both interfaces simultaneously
for data transfer. Both interfaces have an active status. If the interface link to one NIC goes offline,
the other interface continues operating. Using both NICs also increases network bandwidth.
Requirements for link aggregation dynamic mode
To configure Link Aggregation Dynamic Mode:
Both NICs should be enabled.
NICs must be configured to the same subnet.
NICs must be connected to a single switch that is LACP-capable and supports 802.3ad link
aggregation.

Which physical interface is preferred

Because the logical interface uses both NICs simultaneously for data transfer, neither of the NICs
in an aggregation bond is designated as preferred.
illustrates the Active-Passive configuration in a four-switch topology.
Configuring network interface bonds 57