Which Physical Interface Is Preferred; Which Physical Interface Is Active; Summary Of Nic States During Failover; Link Aggregation Dynamic Mode Failover Scenario And Corresponding Nic Status - HP StorageWorks P4000 User Manual

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.

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 Eth0 and Eth1 are bonded in a Link Aggregation Dynamic Mode bond. If Eth0 fails, then
Eth1 remains active.
Once the link is fixed and Eth0 is operational, it becomes active again. Eth1 remains active.
Table 24 Link aggregation dynamic mode failover scenario and corresponding NIC status
Example failover scenario
1. Link Aggregation Dynamic Mode bond0 is created.
Eth0 and Eth1 are both active.
2. Eth0 interface fails. Because Link Aggregation Dynamic
Mode is configured, Eth1 continues operating.
3. Eth0 link failure is repaired.

Summary of NIC states during failover

Table 25 on page 93 shows the states of Eth0 and Eth1 when configured for Link Aggregation Dynamic
Mode.
Table 25 NIC status during failover with link aggregation dynamic mode
Failover status
Normal Operation
Eth0 Fails, Data Transfer
Fails Over to Eth1
Eth0 Restored
Status of Eth0
Preferred: No
Status: Active
Data Transfer: Yes
Preferred: No
Status: Passive (Failed)
Data Transfer: No
Preferred: No
Status: Active
Data Transfer: Yes
NIC status
• Bond0 is the master logical interface.
• Eth0 is Active.
• Eth1 is Active.
• Eth0 status becomes Passive (Failed).
• Eth1 status remains Active.
• Eth0 resumes Active status.
• Eth1 remains Active.
Status of Eth1
Preferred: No
Status: Active
Data Transfer: Yes
Preferred: No
Status: Active
Data Transfer: Yes
Preferred: No
Status: Active
Data Transfer: Yes
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