Brocade Communications Systems 8 Administrator's Manual page 36

2
Access Gateway mapping
NOTE
Port Grouping Policy is not supported when both Automatic Login Balancing and Device Load
Balancing are enabled.
Device-based mapping does not affect or replace the traditional port mapping. Device mapping is
an optional mapping that will exist on top of existing port mapping. In general mapping devices to
N_Port groups is recommended over mapping devices to individual N_Ports within a port group.
This ensures maximum device "up-time," especially during fail-over conditions and system power
up. This is especially true when a reasonably large number of devices must connect to the same
fabric through a single port group.
These aspects of device mapping are important to note:
•
•
Figure 5
WWNs 1, 2, and 3 can connect to any N_Port in Port Group 1 (PG1), while WWNs 4 and 5 can
connect with any N_Port in Port Group 2 (PG2).
16
Logins from a device mapped to a specific N_Port or N_Port group (device mapping) always
have priority over unmapped devices that log into an F_Port that has been mapped to the
same N_Port or N_Port group (port mapping).
Current device routing (dynamic mapping) may turn out different than your intended mapping
(static mapping), depending on which N_Ports are online and which policies are enabled (for
example, automatic port configuration, device load balancing, failover, or failback). Therefore,
it is recommended to map devices to N_Port groups instead of specific N_Ports within a port
group when using device mapping.
NOTE
Automatic port configuration and device load balancing cannot be enabled at the same time.
on page 17 illustrates an example of device mapping to port groups. In the example,
Access Gateway Administrator's Guide
53-1001760-01