McDATA® 4Gb SAN Switch for HP p-Class BladeSystem user guide
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Domain ID and domain ID lock
The domain ID is a unique Fibre Channel identifier for the switch. The Fibre Channel address consists of the
domain ID, port ID, and the Arbitrated Loop Physical Address (ALPA). Switches come from the factory with
the Domain ID Lock setting disabled (False). This means that if there is a domain ID conflict in the fabric,
the switch with the highest principal priority, or the principal switch, will reassign any domain ID conflicts
and establish the fabric. If you lock the domain ID on a switch and a domain ID conflict occurs, one of the
switches will isolate as a separate fabric and the Logged-In LEDs on both switches will flash to show the
affected ports. See the
Set Config Switch
command to change the Domain ID Lock and Principal
Priority parameters. Refer to the
McDATA 4Gb SAN Switch for HP p-Class BladeSystem command line
interface guide
for information about the
Set Config Switch
command and the command line
interface.
If you connect a new switch to an existing fabric with its domain ID unlocked, and a domain conflict
occurs, the new switch will isolate as a separate fabric. However, you can remedy this by resetting the new
switch or taking it offline then back online. The principal switch will reassign the domain ID and the switch
will join the fabric.
NOTE:
Domain ID reassignment is not reflected in zoning that is defined by domain ID and port number
pair. You must reconfigure zones that are affected by domain ID reassignment.
The McDATA 4Gb SAN Switch displays domain IDs differently in Standard mode than other M-series
directors and edge switches. When the McDATA 4Gb SAN switch is in Standard mode (default), the
domain ID will be displayed differently depending on which management utility is used. The valid Domain
ID range while in standard mode (default) is 97—127. McDATA Web Server and CLI will display this as
97—127. HAFM will display this as 1—31.
Prior to changing from Standard mode to McDATA Fabric mode, it is recommended that the switch be
isolated from the fabric (take switch offline) before making the configuration changes and all domain IDs in
the fabric should be noted to avoid conflicts. Once isolated, using CLI or McDATA Web Server, change
interop mode to McDATA Fabric mode, and change the domain ID to a unique ID within the valid range of
1—31 for McDATA Fabric mode. It is then recommended that the Domain ID be locked to prevent conflict
within the fabric. When all changes have been made and the switch has been brought back online, it
should then be added into the fabric.
In McDATA Fabric mode, the McDATA 4Gb SAN Switch will display the domain IDs the same as other
M-series directors and edge switches no matter which management utility is used. The valid domain ID
range is 1—31 for McDATA Fabric mode.
Prior to changing from McDATA Fabric mode to Standard mode, it is recommended that the switch be
isolated from the fabric (take switch offline) before making the configuration changes and all domain IDs in
the fabric should be noted to avoid conflicts. Once isolated, using McDATA Web Server, Element
Manager, or the CLI, change interop mode to Standard and change the domain ID to a unique ID within
the valid range of 97—127 for standard mode. It is then recommended that the Domain ID be locked to
prevent conflict within the fabric. When all changes have been made and the switch has been brought
back online, it should then be added into the fabric.
Both Standard Mode and McDATA Fabric Mode permit a maximum of 31 domain IDs. For fabrics in which
all other switches support 239 domain IDs, you can extend the valid domain IDs on the McDATA 4Gb
SAN Switch to 1-239 by enabling 239 Domain Support. See ”
Interop mode
” on page 73 for more
information.
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