SG0-001 · Question #286
What determines the principle switch in a Fibre Channel Fabric?
The correct answer is C. assigned priority. The principal switch in a Fibre Channel fabric is determined during the principal switch selection process, primarily by an assigned priority value.
Question
What determines the principle switch in a Fibre Channel Fabric?
Options
- Ahighest Domain ID
- Bhighest world wide name
- Cassigned priority
- Dlowest Domain ID
How the community answered
(21 responses)- A5% (1)
- B5% (1)
- C90% (19)
Why each option
The principal switch in a Fibre Channel fabric is determined during the principal switch selection process, primarily by an assigned priority value.
The Domain ID is an identifier for a switch within the fabric and is assigned by the principal switch; it does not determine the principal switch itself.
While the WWN is used as a tie-breaker if priorities are equal, it is not the primary determinant for principal switch election; it is the lowest WWN that acts as a tie-breaker, not the highest.
In a Fibre Channel fabric, the principal switch election process is initiated when switches join or when changes occur. Switches exchange their priority values, and the switch with the highest priority is typically elected as the principal switch. If priorities are equal, the switch with the lowest World Wide Name (WWN) acts as a tie-breaker.
The Domain ID is assigned, and the lowest Domain ID does not determine the principal switch; the lowest WWN is a tie-breaker, not the lowest Domain ID.
Concept tested: Fibre Channel principal switch election criteria
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/4_1/configuration/guides/fabric/fcrg_4_1_chapter04.html
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