Brocade Access Gateway Admin Guide v6.1.0 (53-1000605-02, June 2008)

Access Gateway Administrator’s Guide 15
53-1000605-02
Access Gateway policies
2
Disabling the Failover policy
1. Connect to the switch and log in as admin.
2. Enter the ag command with the
--failovershow <n_portnumber> operand to display the
failover setting.
switch:admin> ag --failovershow 13
Failover on N_Port 13 is supported
3. Enter the ag --failoverdisable <n_portnumber> operand to disable failover.
switch:admin> ag --failoverdisable 13
Failover policy is disabled for port 13
Failback policy
The Failback policy automatically reroutes the F_Ports back to the primary mapped N_Ports as
those N_Ports come back online, if the Failback policy is enabled for the N_Port.
Only the originally mapped F_Ports fail back. In the case of multiple N_Port failures, only F_Ports
that were mapped to the recovered N_Port experience failback. The remaining F_Ports are not
redistributed among the online N_Ports during the failback. If the APC policy is enabled, by default,
the failback policy is disabled.
NOTE
The Failback policy is an N_Port parameter. By default, the Failback policy is enabled.
The following sequence describes how a failback event occurs:
• When an N_Port comes back online, with the Failback policy enabled, the F_Ports that were
originally mapped to it are disabled.
• The F_Port is rerouted to the primary mapped N_Port, and then re-enabled.
• The host establishes a new connection with the fabric.
Example: Failback Policy
In Example 3, described in Figure 5 on page 16, the Access Gateway N_1 remains disabled
because the corresponding F_A1 port is offline. However, N_2 comes back online. See Figure 4 on
page 14 for the original failover scenario.
The ports F_1 and F_2 are mapped to N_1 and continue routing to N_3. Ports F_3 and F_4, which
were originally mapped to N_2, are disabled and rerouted to N_2, and then enabled.