Fabric OS Administrator’s Guide 329
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Supported hardware in an interoperable environment 14
•Trunking
Fabric OS switches support trunking when participating in Brocade Native, McDATA Fabric, or
McDATA Open Fabric mode. Trunk ports (bandwidth aggregation) only apply to an ISL between
two Fabric OS switches. Note the following:
-Fabric OS frame-based trunking
Fabric OS frame-based trunking is supported for ISLs between two Fabric OS switches.
Multiple ISLs between a Fabric OS switch and an M-EOS type switch are allowed, but no
frame-based trunking occurs.
-Fabric OS exchange-level trunking (DPS) and source-port route balancing (DLS)
These are supported for connections between Fabric OS switches and M-EOS switches.
-M-EOS Open Trunking
This is supported for outbound ISLs from any M-EOS switch to any switch in the fabric.
•Domain ID offset configuration
When installing Brocade switches to an existing McDATA fabric, this feature allows different
fabrics to have different ranges and expands the range of domains that Fabric OS switches
support in interopmodes 2 and 3. It does not increase the maximum number (31) of switches
in a fabric. Note the following:
-Domain ID offset configuration is used by M-EOS switches in assigning the first byte of the
PID for attached end devices. McDATA Fabric mode supports a domain ID range from 1 to
31 and McDATA Open Fabric mode supports a domain ID range of 97-127; the starting
offset of this range of domain IDs can be modified. The offset value, which changes the
range in a multiple of 31, is added to the actual domain ID of the switch and is used in
assigning the PID. Traditionally, M-EOS-based switches used an offset of 96. For example,
a switch with a domain ID configured to 3 would assign a value of 99 to the first byte of all
PIDs and the domain ID range would be 97-127.
-Domain ID offset configuration changes affect the domain ID, so all actions associated
with this change must also be made to the domain ID.
-In addition to implementing this feature using the CLI, you can also use DCFM, Web Tools,
or any other user interface, but the domain ID offset must be consistent among all the
user interfaces.
For instructions to convert decimal numbers to hexadecimal, refer to Appendix E,
“Hexadecimal”.

Supported hardware in an interoperable environment

The following matrix identifies the Fabric OS hardware platforms that are interoperable with M-EOS
hardware platforms. McDATA Fabric mode and McDATA Open Fabric mode are not supported on the
Brocade 8000.