Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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11-9
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 11 Configuring Domain Parameters
Domain IDs
Figure 11-7 Configuration Process Using the Preferred Option
The operation of a subordinate switch changes based on three factors:
• The allowed domain ID lists.
• The configured domain ID.
• The domain ID that the principal switch has assigned to the requesting switch.
In specific situations, the changes are as follows:
• When the received domain ID is not within the allowed list, the requested domain ID becomes the
runtime domain ID and all interfaces on that VSAN are isolated.
• When the assigned and requested domain IDs are the same, the preferred and static options are not
relevant, and the assigned domain ID becomes the runtime domain ID.
• When the assigned and requested domain IDs are different, the following cases apply:
– If the configured type is static, the assigned domain ID is discarded, all local interfaces are
isolated, and the local switch assigns itself the configured domain ID, which becomes the
runtime domain ID.
– If the configured type is preferred, the local switch accepts the domain ID assigned by the
principal switch and the assigned domain ID becomes the runtime domain ID.
If you change the configured domain ID, the change is only accepted if the new domain ID is included
in all the allowed domain ID lists currently configured in the VSAN. Alternatively, you can also
configure zero-preferred domain ID.
Caution You must restart the fcdomain if you want to apply the configured domain changes to the runtime
domain.
Local WWN
20:02:ab:ba:cd:dc:f4:00
Configured domain ID
7 preferred
Runtime domain ID = 7
Configured priority = 128
Runtime priority = 128
Runtime fabric name
20:01:ab:ba:cd:cd:dc:f4
Local WWN
20:01:ab:ba:cd:dc:f4:00
Configured domain ID
0 (zero) preferred
Runtime domain ID = 3
Configured priority = 128
Runtime priority = 2
Runtime fabric name
20:01:ab:ba:cd:cd:dc:f4
Local WWN
20:04:ab:ba:cd:dc:f4:00
Configured domain ID
0 (zero) preferred
Runtime domain ID = 3
Configured priority = 128
Runtime priority = 2
Runtime fabric name
20:01:ab:ba:cd:cd:dc:f4
Local WWN
20:03:ab:ba:cd:dc:f4:00
Configured domain ID
7 preferred
Runtime domain ID = 51
Configured priority = 128
Runtime priority = 128
Runtime fabric name
20:01:ab:ba:cd:cd:dc:f4
1. Request configured
domain ID (7).
2. Requested domain
ID assigned,
if available (7).
3. Otherwise, another
available domain
ID assigned (51).
Switch 7 (subordinate) Switch 2 (principal)
Switch 7 (subordinate) Switch 2 (principal)
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