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

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11-10
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 11 Configuring Domain Parameters
Domain IDs
Note If you have configured an allow domain ID list, the domain IDs that you add must be in that range for
the VSAN. See the “About Allowed Domain ID Lists” section on page 11-10.
Specifying Static or Preferred Domain IDs
When you assign a static domain ID type, you are requesting a particular domain ID. If the switch does
not obtain the requested address, it will isolate itself from the fabric. When you specify a preferred
domain ID, you are also requesting a particular domain ID; however, if the requested domain ID is
unavailable, then the switch will accept another domain ID.
While the static option can be applied at runtime after a disruptive or nondisruptive restart, the preferred
option is applied at runtime only after a disruptive restart (see the “About Domain Restart” section on
page 11-3).
Note Within a VSAN all switches should have the same domain ID type (either static or preferred). If a
configuration is mixed (some switches with static domain types and others with preferred), you may
experience link isolation.
To specify a static or preferred domain ID using Fabric Manager, perform this task:
Step 1 Expand Fabricxx > VSANxx, and then choose Domain Manager in the Logical Domains pane for the
fabric and VSAN that you want to configure the domain ID for.
You see the running configuration of the domain in the Information pane.
Step 2 Enter a value for the Config DomainID and click static or preferred from the Config Type drop-down
list to set the domain ID for switches in the fabric.
Step 3 Click the Apply Changes icon to save these changes.
About Allowed Domain ID Lists
By default, the valid range for an assigned domain ID list is from 1 to 239. You can specify a list of
ranges to be in the allowed domain ID list and separate each range with a comma. The principal switch
assigns domain IDs that are available in the locally configured allowed domain list.
Use allowed domain ID lists to design your VSANs with nonoverlapping domain IDs. This helps you in
the future if you need to implement IVR without the NAT feature.
Tip If you configure an allowed list on one switch in the fabric, we recommend that you configure the same
list in all other switches in the fabric to ensure consistency or use CFS to distribute the configuration.
An allowed domain ID list must satisfy the following conditions:
• If this switch is a principal switch, all the currently assigned domain IDs must be in the allowed list.
• If this switch is a subordinate switch, the local runtime domain ID must be in the allowed list.