Which physical interface is active
When the Link Aggregation Dynamic Mode bond is created, if both NICs are plugged in, both
interfaces are active. If one interface fails, the other interface continues operating. For example,
suppose Motherboard:Port1 and Motherboard:Port2 are bonded in a Link Aggregation Dynamic
Mode bond. If Motherboard:Port1 fails, then Motherboard:Port2 remains active.
Once the link is fixed and Motherboard:Port1 is operational, it becomes active again.
Motherboard:Port2 remains active.
Table 21 Link aggregation dynamic mode failover scenario and corresponding NIC status
NIC status
Example failover scenario
1. Link Aggregation Dynamic Mode bond0 is created.
Motherboard:Port1 and Motherboard:Port2 are both active.
•
Bond0 is the master logical interface.
•
Motherboard:Port1 is Active.
•
Motherboard:Port2 is Active.
2. Motherboard:Port1 interface fails. Because Link
Aggregation Dynamic Mode is configured,
Motherboard:Port2 continues operating.
•
Motherboard:Port1 status becomes Passive (Failed).
•
Motherboard:Port2 status remains Active.
3. Motherboard:Port1 link failure is repaired.
•
Motherboard:Port1 resumes Active status.
•
Motherboard:Port2 remains Active.
Summary of NIC states during failover
Table 22 (page 58)
shows the states of Motherboard:Port1 and Motherboard:Port2 when configured
for Link Aggregation Dynamic Mode.
Table 22 NIC status during failover with link aggregation dynamic mode
Status of Motherboard:Port2
Status of Eth0
Failover status
Preferred: No
Preferred: No
Normal Operation
Status: Active
Status: Active
Data Transfer: Yes
Data Transfer: Yes
Preferred: No
Preferred: No
Motherboard:Port1 Fails, Data
Transfer Fails Over to
Motherboard:Port2
Status: Active
Data Transfer: Yes
Status: Passive (Failed)
Data Transfer: No
Preferred: No
Preferred: No
Motherboard:Port1 Restored
Status: Active
Status: Active
Data Transfer: Yes
Data Transfer: Yes
Example network cabling topologies with link aggregation dynamic mode
A simple network configuration using Link Aggregation Dynamic Mode in a high-availability
environment is illustrated in
Figure 28 (page 59)
.
58
Managing the network