HP Cisco MDS 9216 - Fabric Switch Configuration Manual page 491

Chapter 25 Configuring Domain Parameters
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
The principal switch assigns the requested domain ID if available. Otherwise, it assigns another
2.
available domain ID.
Figure 25-7
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 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.
OL-16184-01, Cisco MDS SAN-OS Release 3.x
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)
– 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.
1. Request configured
domain ID (7).
2. Requested domain
ID assigned,
if available (7).
3. Otherwise, another
available domain
ID assigned (51).
Cisco MDS 9000 Family CLI Configuration Guide
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)
Domain IDs
25-9