Brocade Communications Systems Brocade BladeSystem 4/24, Руководство администратора

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12 Access Gateway Administrator’s Guide
53-1000605-01
Access Gateway policies
1
ATTENTION
If N_Ports connected to unrelated fabrics are grouped together, N_Port failover within a port group
can cause the F_Ports to connect to a different fabric and the F_Port may lose connectivity to the
targets it was connected to before failover, causing I/O disruption.
You can create new port groups and add N_Ports to these groups. However, all N_Ports which are
not part of any user-created port group will be part of the default port group pg0.
Creation of overlapping port groups is not allowed. So if you have an N_Port that is specified as a
Preferred Secondary N_Port and belongs to another port group, it cannot be part of any other port
group. Port Group creation would fail in this case.
NOTE
If this policy is disabled while the Access Gateway switch is online, all the user-defined port groups
will be deleted, but F_Port to N_Port mappings will remain unchanged.
While Port Grouping policy is set, Preferred Secondary N_Ports can be set only in accordance with
existing Port Groups. While Port Grouping policy is in force, setting an N_Port as Preferred for
F_Ports will fail if any of the specified F_Ports are mapped to another N_Port outside the Port
Group.
Firmware upgrade and downgrade
If you upgrade the firmware from v5.3.x to v6.0.0, then the PG policy is enabled with the default
port group pg0 containing all the N_Ports. A firmware downgrade from v6.0.0 to v5.3.x is not
allowed if the PG policy is enabled. You must disable the PG policy before downgrading the
firmware.
NOTE
During a downgrade to v5.3.x, all preferred settings are lost.
Automatic port configuration (APC)
APC is an optional policy and is disabled by default. When APC is enabled, the Access
Gateway-enabled switch automatically discovers the port type. For example, if a switch is
connected to a port on Access Gateway, then Access Gateway determines that it is connected to a
switch and configures the port as an N_Port. If a host is connected to a port on Access Gateway,
then Access Gateway determines that it is connected and configures the port as an F_Port.
After all the port types are determined, dynamic mapping between F_Ports and N_Ports is created
and evenly distributes F_Ports across all N_Ports. While the APC is enabled, you cannot manually
configure F_Ports to N_Port mapping.
ATTENTION
When this policy is enabled, existing F_Port to N_Port mappings are deleted. This process is
disruptive to F_Ports and N_Ports. It is recommended that the switch is disabled when this policy is
enabled. Therefore, it is recommended to perform a configupload before enabling this feature.
When this policy is disabled, N_Port configuration and F_Port to N_Port mapping revert back to the
default factory configuration for that platform.