S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
17-8
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 17 Configuring Domain Parameters
Domain IDs
If you do not configure a domain ID, the local switch sends a random ID in its request. We recommend
that you use static domain IDs.
When a subordinate switch requests a domain, the following process takes place (see
Figure 17-2
):
1.
The local switch sends a configured domain ID request to the principal switch.
2.
The principal switch assigns the requested domain ID if available. Otherwise, it assigns another
available domain ID.
Figure 17-2
Configuration Process Using the preferred Option
The behavior for 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.
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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