Dell Brocade G620 Brocade 8.0.1 Fabric OS Administratiors Guide - Page 61
Domain IDs, Domain ID issues
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Performing Basic Configuration Tasks In switch mode, the principal or primary FCS switch synchronizes its time with the external NTP server every 64 seconds and sends time updates to other switches in the fabric. The time updates are not sent in-band to AG devices. An AG device need not sync with the external NTP server as it can receive NTP server configuration from the connected FOS switch. If the AG device is connected to more than one fabric, the latest clock server request received is configured. Consider the following points when distributing the NTP server configuration: ∙ The tsClockServer command distributes the NTP server configuration to all switches within the fabric and AG devices connected to the same fabric. ∙ Already distributed NTP server configurations will persist on the AG device after firmware downgrade from Fabric OS 8.0.1 to a prior version on supported platforms. Domain IDs Although domain IDs are assigned dynamically when a switch is enabled, you can change them manually so that you can control the ID number or resolve a domain ID conflict when you merge fabrics. If a switch has a domain ID when it is enabled, and that domain ID conflicts with another switch in the fabric, the conflict is automatically resolved if the other switch's domain ID is not persistently set. The process can take several seconds, during which time traffic is delayed. If both switches have their domain IDs persistently set, one of them needs to have its domain ID changed to a domain ID not used within the fabric. Prior to Fabric OS 7.4.0, the default domain ID for Brocade switches was 1. Starting with Fabric OS 7.4.0, the xlate domain ID (XD) or front domain ID (FD) for an FC Router is assigned in the following ranges, if the insistent domain ID is not configured. ∙ The FD range for an FC Router is 160 through 199. The default front domain ID requested by an FC Router is 160. ∙ The XD range for an FC Router is 200 through 239. The default xlate domain ID requested by an FC Router is 200. NOTE If there is no free domain ID available in the specified range for XD or FD, the principal switch assigns the lowest available domain ID starting from 1. The principal switch must be running Fabric OS 7.4.0 or later. The principal switch overrides the specified domain ID range if the following conditions are true: ∙ If the insistent domain ID is configured for FD or XD ∙ The requested domain ID is not in the specified range ∙ The requested domain ID is available for domain ID assignment When a switch, other than the FC Router FD or XD, requests a domain ID within the new specified range for the FC Router FD or XD, the principal switch assigns the domain ID, if it is available. NOTE It is recommended that the Insistent Domain ID be configured when deploying features that rely on domain IDs, such as [D, I] Zoning, and TI Zoning. Domain ID issues Keep the following restrictions in mind when working with domain IDs. ∙ Do not use domain ID 0. Using this domain ID can cause the switch to reboot continuously. ∙ Avoid changing the domain ID on the FCS switch in secure mode. ∙ To minimize downtime, change the domain IDs on the other switches in the fabric. Brocade Fabric OS Administration Guide, 8.0.1 53-1004111-02 61
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