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200-150 · Question #208

Which reason for configuring a Cisco Nexus 5000 Series switch in NPV mode is valid?

The correct answer is D. to alleviate the domain ID limit by sharing the domain ID with the edge switches. NPV mode on a Cisco Nexus 5000 eliminates the need for the edge switch to claim its own FC domain ID by proxying N-Port logins through the core NPIV-enabled switch.

Cisco Data Center Storage

Question

Which reason for configuring a Cisco Nexus 5000 Series switch in NPV mode is valid?

Options

  • Ato increase the domain ID limit by assigning subdomain IDs to the edge switches
  • Bto share all the domain IDs with the core and edge switches
  • Cto eliminate the domain ID limit by assigning a different domain ID to the core switch
  • Dto alleviate the domain ID limit by sharing the domain ID with the edge switches

How the community answered

(40 responses)
  • A
    15% (6)
  • B
    8% (3)
  • C
    5% (2)
  • D
    73% (29)

Why each option

NPV mode on a Cisco Nexus 5000 eliminates the need for the edge switch to claim its own FC domain ID by proxying N-Port logins through the core NPIV-enabled switch.

Ato increase the domain ID limit by assigning subdomain IDs to the edge switches

NPV mode does not introduce subdomain IDs or increase the 239-domain-ID ceiling; it avoids consuming domain IDs on edge switches entirely.

Bto share all the domain IDs with the core and edge switches

NPV mode does not share domain IDs across all switches in the fabric; only the core NPIV switch holds a domain ID while the NPV switch holds none.

Cto eliminate the domain ID limit by assigning a different domain ID to the core switch

NPV mode does not assign a different domain ID to the core switch; the core switch retains its own domain ID and the NPV switch simply does not register for one.

Dto alleviate the domain ID limit by sharing the domain ID with the edge switchesCorrect

Fibre Channel fabrics support a maximum of 239 domain IDs per fabric, which can be exhausted in large deployments. When a Nexus 5000 operates in NPV mode, it does not participate in the FC domain ID allocation process and instead forwards all device logins to the upstream NPIV-capable core switch. All end devices behind the NPV switch appear as virtual N-Ports on the core switch's domain, effectively sharing that domain ID and conserving the limited domain ID space.

Concept tested: NPV mode domain ID conservation in FC fabrics

Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/san_switching/Cisco_Nexus_5000_Series_NX-OS_SAN_Switching_Configuration_Guide.html

Topics

#NPV mode#domain ID#Nexus 5000#Fibre Channel

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