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200-150 · Question #149

An administrator connected a new server to a Cisco MDS 9222i on port fc 1/5, but did not capture the world wide node of the host bus adapter. Which command returns the needed information?

The correct answer is C. show flogi database. On Cisco MDS switches, the 'show flogi database' command reveals all devices that completed a Fabric Login, including their World Wide Node Names (WWNN) and World Wide Port Names (WWPN) per interface.

Cisco Data Center Storage

Question

An administrator connected a new server to a Cisco MDS 9222i on port fc 1/5, but did not capture the world wide node of the host bus adapter. Which command returns the needed information?

Options

  • Ashow wwn status
  • Bshow hosts
  • Cshow flogi database
  • Dshow interface fc 1/5

How the community answered

(62 responses)
  • A
    5% (3)
  • B
    3% (2)
  • C
    79% (49)
  • D
    13% (8)

Why each option

On Cisco MDS switches, the 'show flogi database' command reveals all devices that completed a Fabric Login, including their World Wide Node Names (WWNN) and World Wide Port Names (WWPN) per interface.

Ashow wwn status

'show wwn status' displays the WWN block assignments of the MDS switch itself, not the WWNs of devices connected to its ports.

Bshow hosts

'show hosts' is not a standard Cisco MDS NX-OS command used to display Fabric Login records or HBA WWN information.

Cshow flogi databaseCorrect

The 'show flogi database' command displays the Fabric Login database, which records every HBA and storage device that has logged into the fabric, listing their WWNN, WWPN, and assigned FC ID mapped to the specific MDS interface they are connected through. When the server on fc 1/5 powered on, its HBA sent a FLOGI request that was recorded in this database, making it the correct command to retrieve the WWNN without needing physical access to the server.

Dshow interface fc 1/5

'show interface fc 1/5' displays interface-level operational statistics, counters, and link state for the port, but does not show the WWNN or WWPN of the connected device.

Concept tested: Cisco MDS FLOGI database command for HBA WWN discovery

Source: https://www.cisco.com/c/en/us/td/docs/storage/mds9000/sw/7_3/command/reference/mds9000_cmd_ref_7_3/show_f_commands.html

Topics

#FLOGI database#WWNN#HBA#MDS switch

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