Configuration Management For Trunk Areas; Example: How Trunk Area Assignment Affect The Port Domain,Index; Trunking For Switches In Access Gateway Mode; F_Port Trunking In Virtual Fabrics - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

old master and install the monitor on the new master port. If you attempt to add a monitor to a slave port,
it is automatically added to the master port instead.

Configuration management for trunk areas

Ports from different ADs are not allowed to join the same Trunk Area group. The portTrunkArea
command prevents the different ADs from joining the TA group.
When you assign a TA, the ports within the TA group have the same Index. The Index that was assigned to
the ports is no longer part of the switch. Any Domain,Index (D,I) AD that was assumed to be part of the
domain may no longer exist for that domain because it was removed from the switch. 0

Example: How Trunk Area assignment affect the port Domain,Index

If you have AD1: 3,7; 3,8; 4,13; 4,14 and AD2: 3,9; 3,10, and then create a TA with Index 8 with ports
that have index 7, 8, 9, and 10, index 7, 9, and 10 are no longer with domain 3. This means that AD2
does not have access to any ports because index 9 and 10 no longer exist on domain 3. This also means
that AD1 no longer has 3,7 in effect because Index 7 no longer exists for domain 3. AD1's 3,8, which is
the TA group, can still be seen by AD1 along with 4,13 and 4,14.
A port within a TA can be removed, but this adds the Index back to the switch. For example, the same AD1
and AD2 with TA 8 holds true. If you remove port 7 from the TA, it adds Index 7 back to the switch. That
means AD1's 3,7 can be seen by AD1 along with 3,8; 4,13 and 4,14.

Trunking for switches in Access Gateway mode

On switches in AG mode, only the external port or the N_Port can connect to an AG switch. Use the
masterless trunking feature to trunks N_Ports. After F_Ports are assigned or are mapped to an N_Port, the
N_Port distributes frames across a set of available paths between the AG switch and the adjacent fabric
edge switch. Following are the advantages of N_Port trunking:
• When one or more N_Ports in a trunk group goes offline, there is no change in the PID for the F_Ports
that were mapped to the N_Ports as long as at least one N_Port in the trunk group is active. This
provides for a transparent path failover and failback within the trunk group.
• N_Port links are efficient because of the trunking algorithm implemented in the switching ASICs, which
distributes the I/O evenly across the N_Ports.
• Trunk groups cannot span across multiple N_Port groups within a switch in AG mode.
• Multiple trunk groups are allowed within the same N_Port group.
For additional information on how to configure ports in Access Gateway mode, see the Access Gateway
Administrator's Guide.

F_Port Trunking in Virtual Fabrics

F_Port trunking functionality performs the same in Virtual Fabrics as it does in non-virtual fabric platforms
except for the HP StorageWorks DC SAN Backbone Director. Fabric OS 6.2.0 uses a 10-bit addressing
model, which is the default mode for all dynamically created Logical Switches in the HP StorageWorks DC
SAN Backbone Director platform.
In the HP StorageWorks DC SAN Backbone Director platform, F_Port trunk ports dynamically receive an
8-bit area address that remains persistent. After F_Port trunking configurations are removed from a port in
a Logical Switch, that port returns to the default 10-bit area address model, which supports up to 1024
F_Ports in a Logical Switch.
NOTE: Because the HP StorageWorks DC SAN Backbone Director platform has a maximum of 448 ports,
out of the 1024 10-bit address range, addresses 576- 1 023 are reserved for the 10-bit address space.
Addresses 0–575 are reserved to assign to NPIV/Loop ports to support 144 [576/4] NPIV/Loop ports in a
Logical Switch with 256 devices each.
The HP StorageWorks DC04 SAN Director Switch supports trunk groups with up to eight ports. The
trunking groups are based on the user port number with contiguous eight ports as one group, for example
0–7, 8–15, and 16–23.
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