Users Guide

Access Gateway Administrator’s Guide 51
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Failover policy
3
NOTE
If failover and failback policy are disabled, an F_Port mapped to an N_Port will go offline when the
N_Port goes offline and it will go online when the N_Port comes online.
Failover configurations in Access Gateway
The following sequence describes how a failover event occurs:
• An N_Port goes offline.
• All F_Ports mapped to that N_Port are temporarily disabled.
• If the Failover policy is enabled on an offline N_Port, the F_Ports mapped to it will be
distributed among available online N_Ports. If a secondary N_Port is defined for any of these
F_Ports, these F_Ports will be mapped to those N_Ports. If the Port Grouping policy is enabled,
then the F_Ports only fail over to N_Ports that belong to the same port group as the originally
offline N_Port.
Failover example
The following example shows the failover sequence of events in a scenario where two fabric ports
go offline, one after the other. Note that this example assumes that no preferred secondary N_Port
is set for any of the F_Ports.
• First, the Edge switch F_A1 port goes offline, as shown in Figure 11 on page 52 Example 1
(left), causing the corresponding Access Gateway N_1 port to be disabled.
The ports mapped to N_1 fail over; F_1 fails over to N_2 and F_2 fails over to N_3.
• Next, the F_A2 port goes offline, as shown in Figure 11 on page 52 Example 2 (right), causing
the corresponding Access Gateway N_2 port to be disabled.
The ports mapped to N_2 (F_1, F_3, and F_4) fail over to N_3 and N_4. Note that the F_Ports
are evenly distributed to the remaining online N_Ports and that the F_2 port did not participate
in the failover event.