Dell POWEREDGE M1000E - Manual (Page 30)

10 Access Gateway Administrator’s Guide
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Access Gateway mapping
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Access Gateway mapping
When operating in AG mode you must specify pre-provisioned routes that AG will use to direct traffic
from the devices (hosts or targets) on its F_Ports to the ports connected to the fabric using its
N_Ports. This is unlike Native switch mode where the switch itself determines the best path
between its F_Ports. This process of pre-provisioning routes in AG mode is called “mapping.”
During mapping, device WWNs or F_Ports are assigned to N_Ports and N_Port groups on the switch
running in AG mode. Mapping ensures that a device logging into the switch will always connect to
the fabric through a specific N_Port or N_Port group. Two types of mapping are available:
• Port mapping
A specific F_Port is mapped to a specific N_Port. This ensures that all traffic from a specific
F_Port always goes through the same N_Port. To map an F_Port to an N_Port group, simply
map the port to an N_Port that belongs to that port group. All F_Ports mapped to that N_Port
will be part of that port group.
• Device-based mapping (optional)
A specific device WWN is mapped to N_port groups (preferred method) or to specific N_Ports.
Device mapping allows a virtual port to access its destination regardless of which F_Port on
switch its resides on. Device mapping also allows multiple virtual ports on a single physical
machine access multiple destinations residing in different fabrics.
Device-based mapping is optional and should be added on top of existing port maps. Port
mapping must exist at all times.
Port-based mapping
An F_Port needs to be mapped to an N_Port before the F_Port can come online. When you first
enable a switch to AG mode, by default, the F_Ports are mapped to a set of predefined N_Ports. For
default port mapping on supported hardware platforms, refer to
Table 5 . Refer to Adding F_Ports to
an N_Port if you want to change the default mapping.
Figure 4 shows a mapping with eight F_Ports evenly mapped to four N_Ports on a switch in AG
mode. The N_Ports connect to the same fabric through different Edge switches.