Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual page 488

Domain IDs
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
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
1.
2.
Figure 18-2
The behavior for a subordinate switch changes based on three factors:
•
•
•
In specific situations, the changes are as follows:
•
•
•
Cisco MDS 9000 Family CLI Configuration Guide
18-8
The local switch sends a configured domain ID request to the principal switch.
The principal switch assigns the requested domain ID if available. Otherwise, it assigns another
available domain ID.
Configuration Process Using the preferred Option
Switch 7 (subordinate)
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
20:03: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
Switch 7 (subordinate)
The allowed domain ID lists.
The configured domain ID.
The domain ID that the principal switch has assigned to the requesting switch.
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.
1. Request configured
domain ID (7).
2. Requested domain
ID assigned,
if available (7).
3. Otherwise, another
available domain
ID assigned (51).
Chapter 18 Configuring Domain Parameters
Switch 2 (principal)
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
Switch 2 (principal)
OL-18084-01, Cisco MDS NX-OS Release 4.x
Figure 18-2):